352 NORTH AMERICAN FLORA [VoLtumE 9 
Omphalina stellata (Hoffm.) Quél. Ench. Fung. 45. 1886. (Agaricus stellatus (Hoftm.) 
Fries, Syst. Myc. 1: 163. 1821.) Reported from New York by Peck on dead logs and from 
Chicago, Illinois, by Moffatt in grassy places. There seems to be considerable confusion 
among mycologists regarding this species. Specimens at Albany from East Berne are very 
tiny, striate, and orange throughout in the dried condition. 
Omphalina striaepilea (Fries) Quél. Ench. Fung. 43. 1886. (Agaricus striaepileus Fries, 
Monogr. Hymen. Suec. 2: 291. 1863.) Reported by Peck as occurring in New Vork in a 
pale-gray form on sugar maple. Specimens at Albany from North Elba are now striate, and 
chestnut-fuliginous throughout. 
Omphalina umbilicata (Schaeff.) Quél. Enc. Fung. 42. 1886. (Agaricus umbilicatus 
Schaeff. Fung. Bavar. 4: Ind. 46. 1774.) Reported from Greenland by Berkeley. It has the 
general appearance of O. chrysophylla and also approaches Clitocybe. 
36. GYMNOPUS Roussel, Fl. Calvados ed. 2. 62. 1806. 
Agaricus } Collybia Fries, Syst. Myc. 1: 129. 1821. 
Collybia Quél. Champ. Jura Vosg. 56. 1872. 
Lyophyllum P. Karst. Acta Soc. Faun. Fl. Fenn. 2:3. 1881. 
Tephrophana Earle, Bull. N. Y. Bot. Gard. 5: 427. 1909. 
Collybidium Earle, Bull. N. Y. Bot. Gard. 5: 428. 1909. 
Pileus convex, the margin at first incurved, solitary, gregarious, or cespitose: lamellae 
adnate or adnexed, usually white or bright-colored, sometimes gray or blackish: spores hyaline: 
stipe central, smooth, or at times striate, usually slender, with cartilaginous cortex. 
Type species, Agaricus longipes Bull. 
I. SPECIES OCCURRING IN TEMPERATE NorTH AMERICA, EXCEPT THOSE CONFINED TO THE 
* PACIFIC COAST 
Pileus white, whitish, or pale-isabelline, sometimes darker on the disk. 
Pileus entirely white or whitish, unchanging. 
Pileus 4-6 mm. broad. 1. 
Pileus 6-15 mm. broad. 
Pileus slightly umbilicate. 
Pileus obtuse or subumbonate. 
Stipe tomentose, attached to a tuber. 
Stipe glabrous, not attached to a tuber. 
Lamellae persistently white or pallid. 
Lamellae becoming rusty-brown on drying. 
Pileus 3-5 em. broad. 
Pileus umbilicate. 
Pileus umbonate. 
Pileus whitish or pale-isabelline, often varying in color or marked with 
a different color on the disk or elsewhere. 
Pileus 2-4 mm. broad. 8. G. conigenoides. 
Pileus 1-4 cm. broad, rarely larger in G. strictipes. 
Pileus differently colored on the disk. 
Pileus whitish tinged with rose-color, dull-white on the disk. 9. G. Eatonae. 
Pileus whitish or smoky-white, brown or blackish on the disk. 10. G. nigrodiscus. 
Pileus not differently colored on the disk. 
Pileus becoming imbricate-scaly. ) ll. G. squamiger. 
Pileus remaining glabrous. 
Pileus umbilicate or becoming depressed. 
Pileus becoming distinctly yellow on drying; odor 
. delicatellus. 
. ludovicianus. 
. tuberosus. 
. albus. 
. microsporus. 
ND WR ww N 
AN AN A A A 
. pallidus. 
. texensis, 
not farinaceous. 12. G. flavescens. 
Pileus not becoming distinctly yellow; odor strongly 
.. _farinaceous. 13. G. farinaceus. 
Pileus plane or convex. 
Lamellae distant. 14. G. sinuatus. 
Lamellae crowded. a 
ae eee oe mui. thick, 15. G. strictipes. 
tipe pale-reddish-brown, 2-4 mm. thick. 16. G. virgini i 
Pileus 5-10 em. broad. eee 
Stipe 5-10 em. long. 
Lamellae narrow, crowded. 17. G. carnosus. 
ae ay broad, distant. 18. G. tenuifolius. 
tipe 10-15 cm. Jong. 7 i 
Pileus distinctly yellow. EG CNC 
ya pho decidedly cespitose. 
Pileus umbonate, vitelline or croceous. 20 h Ca 
Pileus not umbonate, sulfur-yeilow. 21. a rem hens 
