Hypsiszygus tessulatus

Synonyms
     Pleurotus elongatipes


Cortinarius husseyiKey to Gilled Mushrooms     Key
This is a key to gilled mushrooms, that is, mushrooms having a definite cap with a fertile surface consisting of gills. The fruiting body usually also has a stem, although that may be lateral or absent (usually, then, the mushroom is growing from wood). You can use this key to identify mushrooms that you find.



TricholomaAgaricales     Order
Fruiting body containing fibers (usually in the stalk)



Amanita onustaWhite Spored     Suborder
Spore print "light-colored": white or buff, sometimes tinged with pink or tan. Greenish and (except for the Russulales) yellow spore prints also go here
Stalk fibrous, not fracturing like a piece of chalk



TricholomataceaeTricholomataceae     Family
None of the special features distinguishing the other white-spored genera:
Gills not free, as in the Lepiotas and Amanitas
Basidia not extra-long, as in the Hygrophoraceae
Spores smooth, except for Lentinellus



HygrocybeLignicolous Trich     Subfamily
Growing on trees or dead wood, leaves, or sticks, or organic debris, often in moss



Pleurotus ostreatusTough LignoTrich     Tribe
Assume a lateral stem, unless otherwise noted in the diagnoses below
If laterally stemmed, then gills strongly decurrent


Pleurotus ostreatusOyster LignoTrich     Subtribe
Cap always smooth (perhaps thinly, minutely furry), never scaly or thickly or coarsely hairy
Gills white to buff, though perhaps discoloring yellow (along with cap) in age, unless covered by a veil
Growing on wood


Hypsiszygus     Genus
Stalk central, well-defined, up to 8 1/2" long
Causes a brown rot


Hypsiszygus tessulatus     (Bulliard: Fries) Singer

Here are the characters that distinguish this species from the others in its group. For its more general characters, see higher up on the page.
If there's just a few words or a microscopic feature here, a more thorough description can be found above.

Diagnosis

Comments

I have found it on box elder, with the fruiting bodies emerging from the scars left by broken-off branches
Roger Phillips's (1991) Mushrooms of North America gives two nice photos (and descriptions) of this species in slightly different stages of development, under the names Hypsiszygus tessulatus and Pleurotus elongatipes


 

 


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