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Omphalinoid

These white spored mushrooms have a pretty unique shape... a depressed to umbilicate cap (more concave than convex), with the cap edge sometimes not rolled down very much and strongly decurrent gills. To qualify for this category, you also have to be quite small, 2.5cm across or less on average, with a stem only a few mm thick. Larger mushrooms of this description are considered to be of clitocyboid stature. Some Clitocybes are in fact this small (but check here first, this page is shorter), but the decurrent gills or the umbilicate cap may not be quite as extreme. The caps are not usually viscid, there is no partial veil and they might be found on the ground, moss or wood.

In days of yore when we had no better way of determining if mushrooms were related other than whether or not they looked like each other, mushrooms were simply named after their stature, so many of the mushrooms on this page were once named Omphalina. Since then all these new names have been created for the groups that are actually related to each other, but each stature type still has its "core genus" of mushrooms that have kept that name. Ironically, there is only one common Omphalina left!

If your mushroom is especially waxy and colourful, consider that it might be a waxy cap.

Clitocybula abundans may be slightly decurrent and slightly umbilicate, but usually not strongly so.

 

Arrhenia - these are mostly dark brown, but one is a beautiful blue-green. Other Arrhenias are oddly shaped and found on the oddballs page. Most easily confused with Myxomphalia on burnt ground and Omphaliaster with a farinaceous odor. The brown ones are usually hygrophanous. In the Hygrophoroid clade. (See also Omphalina, below).

A. chlorocyanea - one of our most beautiful blue-green mushrooms.

A. epichysium - dark brown on wood. <2.5cm

A. rainierensis - (<2.5cm) on mossy ground with a pubescent stem.

A. onisca - larger (<5cm) with a longer, smooth stem (>2 cm).

A. obscurata - smaller (<1.5cm), short stem on sandy soil or moss.

A. hohensis - very similar, with distant, sometimes marginate gills.

A. sphagnicola - <2.5cm, in sphagnum bogs, cap scurfy

Pseudoomphalina - very similar, yet unrelated (in the Tricholomatoid clade).

Pseudoomphalina  angelesiana (Neohygrophorus angelesianus) - somewhat waxy with a viscid cap. Not hygrophanous. In the spring near snow. Amyloid spores. Tricholomatoid clade. <2.5cm.

 

Xeromphalina - known by their dark wiry stems, which make them resemble some Marasmius, but they are not in that clade, they are probably in the Hygrophoroid clade. All may have somewhat decurrent gills except for X. fulvipes, which may be unrelated and belong in its own genus. Amyloid spores (darkening in iodine).

X. campanella/enigmatica - found on logs usually in large numbers. Cold/temperate weather species.

X. brunneola - related but smaller (<1.5cm), darker, odor icky and taste icky-bitter.

X. cornui/cirris - on duff, debris and moss. Mild. <2cm. X. cirris may be hygrophanous.

X. cauticinalis/campanelloides - similar, also on rotting wood, bitter?

These and others form a clade of species not easily distinguished.

Heimiomyces (X.) fulvipes - adnate gills and convex cap do not look very omphalinoid, but more like Marasmius. Bitter. On duff and debris

 

Rickenella - purple or orange, long stemmed mushrooms on moss, caps <1.5cm (and a lookalike, Loreleia). These may be in the Hymenocheatales order of polypores! That is one of the big surprises to come out of DNA testing, to be sure. It kind of makes me think "Could you guys please run that test just one more time, just to make sure"?

R. swartzii - purple! Top of stem is darker.

R. fibula - orange! Smaller and less waxy than Hygrocybe cantharellus.

Loreleia postii - larger, <2.5cm stem paler?

L. marchantiae - smaller, <5mm, on liverworts.

 

Lichenomphalia - A lichen is a symbiosis between an alga and a fungus, where neither could live if not in the presence of the other. The fungal component of almost all lichens is a member of the Ascomycota (none of which are featured in these pages), but there are two exceptions around here, this basidio-lichen and Multiclavula on the club fungus page. Lichenomphalia is in the Hygrophoroid clade.

Lichenomphalia umbellifera (Omphalina ericetorum) - tan, paler and less colourful than most others and found on logs in the presence of lichen. Hygrophanous.

 

Contumyces/Omphalina/Aphroditeola - three similar but completely unrelated little brown or pink mushrooms.

Contumyces rosellus - pink tones, sometimes marginate gills. Pruinose cap and stem. On moss. See also next. Hymenochaetales.

Omphalina pyxidata - darker pinkish brown than Lichenomphalia, paler than Arrhenia, becoming striate. Hygrophanous. Smooth cap and stem. Tricholomatoid clade.

Clitocybe (?) multicarpa - darker brown cap, stem darkens.

C. (?) variispora - paler, dry and non-hygrophanous cinnamon cap.

Aphroditeola olida (Hygrophoropsis morganii) - pink with white or pink gills, once thought to be a gilled bolete! Smells like tutti-frutti bubble gum! On the ground. A waxy cap relative.

A few from other sections can look Omphalinoid.

Marasmiellus candidus <2.5cm, white (gills turning pink in age), on wood, with dark stem bases.

Mycena picta - <1cm, unique looking gills and distinctly grooved cap.

Gamundia striatula - <2.5cm, cap becoming umbilicate, gills adnate to decurrent. Hygrophanous, striate when moist. Warty spores like Lepista.

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