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Danny’s DNA Discoveries – Hygrophoraceae (Waxy Caps)

by Danny Miller

 

Hygrocybe s.s.

 

First, the dry capped species.

 

Hygrocybe constans (aff miniata)

This very common species is reddish (but as so many others do, may fade to orange or yellow). It is found in soil, moss or rotting debris in forests. It is small (~2.5cm across) with a dry cap that has small scales on it and gills that are not usually decurrent. We have many local sequences, all very good matches for each other (although there are a couple of alleles that can make them look different). Ours is not the true H. miniata of Europe. H. squamulosa may not be here either, the only east coast sequence purporting to be that species (type from NJ) was unlike any of our local DNA, and it wasn't much different from DNA of regular east coast H. 'miniata', so it remains to be seen if H. squamulosa is a true distinct species or not, and if so, if it actually occurs here too. H. constans is an Oregon species from 1912 given its own name because the red colouring didn't fade to orange or yellow (the red was more constant), than usually happens with this species group. It has long been thought to be the same as H. miniata, since the amount of fading can be quite variable, but now that name is a good candidate for the proper name of our local species, although it has yet to be proven.

Hygrocybe constans ('miniata') © Steve Ness

 

Hygrocybe substrangulata

This is very similar and related to H. constans, but usually found in wet moss and described as more scurfy than scaly on the cap (and with slightly larger spores). It is much rarer. The presence of this UK species in the PNW was never suspected until the South Sound Mushroom Club DNA project found it.

Hygrocybe substrangulata © Steve Ness

 

Hygrocybe aff phaeococcinea

Another similar and related undescribed species that may not have scales on the dry cap and usually has an orange-yellow cap margin even when the rest of the mushroom is still red and hasn't faded in colour. It is found in grass (unlike the others?) and probably rare. Since our species is not the true European H. phaeococcinea, we really don't have a good description of it yet and it will be hard to recognize. The presence of this species here was also a discovery by the South Sound Mushroom Club.

Hygrocybe aff phaeococcinea © Steve Ness

 

Hygrocybe sp. MP3955113 - somewhat closely related to H. phaeococcinea in the H. miniata group, it appears to have started out red and faded to orange and yellow. It has a noisy chromatogram in places (but clean 5.8s region) so more specimens are needed to see if this is a legitimate species and if so, how to recognize it. It has only been found once near Mt. Rainier, WA.

Hygrocybe sp. MP3955113 © NAMA and the Field Museum of Natural History

 

Hygrocybe reidii

This is not related to the previous species in the H. miniata group. It is small, pretty consistently bright orange with a dry, essentially smooth cap, adnate gills and often with an odor of honey gone bad. It is uncommon, and also a newly discovered European species by the South Sound club. It was found in the forest.

Hygrocybe reidii © Steve Ness

 

Hygrocybe cantharellus

This species has a longer stem and more strongly decurrent gills than the dry capped H. constans and the others. It is an east coast species also found here.

Hygrocybe turunda is supposedly differentiated by scales that are darker than the rest of the cap. In Europe, there are 4 genetic species that appear to be able to go either way, so I'm not sure what dark scales say about species, since we haven't sequenced any dark scaled specimens from here yet. To confuse things, there has been some debate as to whether or not our local species with dark scales should be called H. turunda or H. coccineocrenata (both European species), but the answer could be neither and we may need new names for any additional species that turn up in the PNW. Hygrocybe turunda var sphagnophila is an east coast name. We have no type sequences of it, but it could turn out to a valid unique species or variety and also be found here.

Hygrocybe cantharellus © Steve Ness, unsequenced H. cf turunda © Andrew Parker

 

Hygrocybe virescens

From California and can be found here under introduced redwood trees, maybe also bay laurel. It is not viscid and is a beautiful, unique, lime-green to greenish-yellow colour.

Hygrocybe virescens © Steve Trudell

 

Most species discussed next will now be viscid, at least on the cap.

 

Hygrocybe aff flavescens

This very common mushroom is yellow (or sometimes orange), with adnexed gills and has a sticky cap and maybe stem too. H. chlorophana is a European species, H. flavescens is an east coast species, and ours is neither but closer to eastern NA material. It could be difficult to tell apart from H. cf minutula, but even when that species fades there should still be some red somewhere, unlike this species, and this species is much more common. There is one sequence from Vancouver BC that is a second genetic species, but we need to verify if it's a dirty sequence or a mistake.

Hygrocybe aff flavescens © Steve Trudell

 

Hygrocbye ceracea

This similar mushroom is golden yellow everywhere with adnate to decurrent gills and is slightly sticky everywhere when wet. Our DNA differs by 2-3 substitutions in ITS and a couple to few indels in ITS2 from European material and is likely the same species.

Hygrocybe subceracea, from Florida, has a dry stem and different sized spores. A sequence of a mushroom that seemed to meet that description from Quebec is close to but distinct from sequences of H. ceracea. It has been reported locally, but we need specimens to examine to prove whether or not it is here.

Hygrocybe ceracea © Steve Ness

 

H. singeri group

The very famous witch's cap mushrooms are very common and identified by red, orange or yellow mushrooms that turn pitch black in age. They have pointy caps and are sticky, usually all over. We do not have H. conica here (that is a European species) but we do have H. singeri (described from OR) and at least two more cryptic species in the group so far. Work will need to be done to figure out how many species we have and how to differentiate them.

Hygrocybe aff singeri #1 © Steve Ness, Hygrocybe aff singeri #2 © NAMA and the Field Museum of Natural History. H. singeri not photographed.

 

H. coccinea group

Larger and stockier than the H. miniata group, these mostly red mushrooms may have yellow on the stems. The cap may be slightly sticky and the gills are not deccurent. We have two species, neither the real European species nor even that closely related (not sister species). The second, less common species, has an all-yellow stem in the one photograph I have.

Hygrocybe cf coccinea #1 © Steve Ness, Hygrocybe cf coccinea #2 © Steve Ness

 

Hygrocybe cf aurantiosplendens

Related species (that are also stocky without decurrent gills) are not well understood yet. We have a species in Washington that looks like the European H. aurantiosplendens but isn't (with splotches of red, orange and yellow on the cap), which may or may not be closely related to the real thing.

Hygrocybe cf aurantiosplendens © Steve Ness

 

Hygrocybe laetissima

Also very similar and related, described from California, it has now been found in Washington by the South Sound Mushroom club. It has a brighter red cap, and a white to yellow stem that is longitudinally fibrillose. In California it is reported from Bay Laurel and Redwood, but in Washington it was found with red cedar that had some bigleaf maple, red alder and hemlocks.

Hygrocybe laetissima © Lauren Ré

 

Hygrocybe 'punicea'

Another similar H. coccinea group relative, with a darker red cap and yellow to orange to red stem that is also longitudinally fibrillose. I do not yet know if ours is the true European species. California sequences are up to 5 bp different, so it's still up in the air.

Hygrocybe 'punicea', California © Christian Schwarz

 

Hygrocybe aff 'mucronella/reae'

It is not looking like ours is the same as the European H. mucronella (also called H. reae), but instead a sister species that needs a new name. It is yet another small, red to orange to yellow mushroom with a sticky cap and stem and gills that are not decurrent. It's distinctive feature is that it is supposed to taste very bitter!

Hygrocybe aff mucronella © Steve Ness

 

Hygrocybe cf minutula

I have no idea if ours is the real thing or not, we need more records of this species from its type area in New York. One of its synonyms is Gliophorus minutulus, because it is sticky all over like many Gliophorus, but it is actually a Hygrocybe. The cap is red fading to orange or yellow, the gills are yellow to orange and may or may not be decurrent.

H. 'subminiata' has been reported a few times from Washington, but we don't have DNA or even a photo of a local collection of that Jamaican species to know if that's one of the species we have here. It is rumoured to be related to the mushrooms in the H. coccinea group, but that can't be confirmed. It is quite small (less than an inch across) with a viscid red cap and yellowish stem and pale gills (that are decurrent). It is easily confused with H. cf minutula.

Hygrocybe cf minutula © Steve Ness

 

Hygrocybe fenestrata np

A smallish mushroom which is quite viscid everywhere, red fading rather quickly to orange and yellow (like many others) but usually with a milky translucent "window" on the cap disc. It is a fairly new discovery from California now known to occur in Washington, and when it gets a name, that name may be Hygrocybe fenestrata, but for now it is "np", or a proposed name only. It was thought to belong in Gliophorus because of it's extremely viscid nature, but it too belongs in Hygrocybe.

Hygrocybe fenestrata np © Steve Ness

 

Poorly understood other species

Hygrocybe sp. MO336328 - this matches the DNA of a mushroom that was identified back east as H. parvula, where H. parvula is described from. I don't know how much it really did look like H. parvula, but I know that our specimen does now. It's a yellow, decurrent waxy and not much more is known about it (at first glance it looked like Glioxanthomyces nitidus).

Hygrocybe sp. MO336328 © Steve Ness

 

Hygrocybe sp. iNat19620764 - yet another red-orange small species. We need to know its gill attachment, viscidity, taste, etc to even begin to tell it apart from the many similar waxies.

Hygrocybe sp. iNat19620764 © Lauren Ré

 

Hygrocybe aff ceracea - fairly closely related to H. ceracea, but red instead of orange. It has been suggested that it might resemble the European mushroom Hygrocybe moseri in some ways, but at this point everything is just a guess. I know of no way yet to recognize it.

Hygrocybe aff ceracea (red) © Steve Ness

 

Locally described species that are probably legitimate but poorly understood

H. californica - we don't have local sequences of H. acutoconica or H. persistens or H. cuspidata, but I suspect at least one of our local species that match these descriptions is H. californica, described, obviously, from California. We need DNA from California and local specimens to see if we have this species and possibly others. They are red-orange-yellow and pointy capped, but do not turn black like the H. singeri group, at least not much.

possible Hygrocybe acutoconica group member © Andrew Parker

 

H. americana - This was called H. acuta until they realized that name was already taken and it had to be renamed. It is described from Oregon. It has a viscid, dark grey-brown very pointy cap and a dry white stem. No DNA is available of anything resembling it yet.

H. luteo-omphaloides - Otherwise known as Omphalina occidentalis, this little yellow moss waxy with decurrent gills, was described from Washington. It may be one of the above species or something new, and it may not even be a Hygrocybe, that has not been proven (the basidia are pretty short). We need samples.

H. albicarnea - white to pale pink, decurrent gills, viscid cap. Snowbank species. Described from Oregon, it is so rare, it is technically still called Hygrophorus albicarneus because it hasn't been moved to Hygrocybe yet.

 

Species reports without genetic data yet

Hygrocybe 'atro-olivacea' - described from Michigan, but reported once from Washington by Hesler & Smith in their iconic monograph. We need to see if it really is the same species. It has somewhat decurrent gills, a dry, somewhat scaly olive-brown cap that is almost black in the center.

Hygrocybe cf atro-olivacea © Renée Lebeuf

 

Hygrocybe 'parvula' - Unlike sp. MO336328 above, we do have reports that look exactly like this east coast species. It has decurrent, bright yellow gills and a yellow-orange, sometimes slightly sticky cap, but the stem is sometimes even more highly coloured (pinkish or orange). Perhaps the stem can be pure yellow and H. sp MO336328 could be related, we'll have to see.

Hygrocybe cf parvula © Buck McAdoo

 

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