The North American species of Psathyrella.

1972]

PSATHYRELLA

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26-28.
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(editor). Evolution in the higher Basidiomycetes. The University of Tennessee Press,
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APPENDIX I
After the manuscript for this work was submitted for publication, a number
of additional undescribed species were discovered by various collectors because of
exceptionally favorable local collecting conditions during 1971. These species
along with some previously considered but not included are grouped here along
with accounts of newly discovered variants of species already in the main body
of the text. The species are all keyed out in their proper sections in the keys in
the body of the text, and the taxa in this appendix are arranged in alphabetical
order. Two previously described species accidentally omitted from the body of
the text are also included here.
399. Psathyrella atomatoides (Peck) A. H. Smith, comb. nov.
Agaricus (Psilocybe) atomatoides Peck, Rep. N. Y. State Mus. 29: 41. 1878.
Psilocybe atomatoides (Peck) Saccardo, Sylloge Fung. 5: 1048. 1887.
Pileus 1-2 cm broad, convex or subcampanulate, then expanded; rugosewrinkled, subhygrophanous, sprinkled with minute shining particles and with
tufts of white floccose fugacious veil, grayish or ochraceous-brown, sometimes with
a pinkish tint; flesh cinereous.
Lamellae rather broad, subventricose, rounded behind, cinereous then dark
brown.
Stipe equal, hollow, clothed when young with minute floccose scales, pruinose
above, whitish.
Spores 7.8-9.3 x 3.7-4.5 /, smooth, germ pore apical and inconspicuous, shape
in face view narrowly ellipsoid to subovoid, in profile somewhat inequilateral,
color in KOH a medium chocolate brown.
Basidia 12-16x6-7 p, 4-spored. Basidioles clavate. Pleurocystidia 36-52x
9-13 I,, fusoid-ventricose with acute to obtuse apex, nearly hyaline or some
brownish as revived in KOH, thin-walled or some with walls up to 1 pu thick; apex
in some encrusted with a dried exudate.