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Phyllotopsis

Field characters

Pileus: fan shaped, with an inrolled margin (at least when young) and densely tomentose.
Annulus: absent
Stipe: absent or rudimentary
Stature: Pleurotoid
Ecology: saprophyte on wood
Odor: disagreeable, variously described as like "rotten cabbage", "sewer gas", and "rotten eggs"

Micro characters

Basidiospores: smooth, hyaline and inamyloid, allantoid (sausage shaped and curved) about 6 by 2 micrometers
Hyphae: sclerotized in the context
Spore Print: pale pinkish
Lamellae: orange, close with lamellulae

Notes

As far as I can tell, only one species (P. nidulans) exists in our area.

I had trouble indentifying this genus. First, the spore print appeared white, and only after real close examination could I detect a pinkish hue. As a result of my mistake, I first thought it was a Panellus. Both genera have allantoid shaped spores, but in Panellus they are amyloid, and in Phyllotopsis they are inamyloid. Both have tomentose pileal surfaces, but only Phyllotopsis has orange colored gills.

Once you see this genus (and get the spore print color right), it is quite distinctive and easily recognized.

Thanks to David Fischer for his help on this one.