Harper: Two Parasitic Mushrooms 
69 
first form, 2-3 X 4~5 They agree with Peck’s njeasurements, 
and also with those given in the Sylloge, 2.5-3 X 4-5 and by 
Stevenson, 3X4 or 3 X 3-5 The plants also agree with 
Peck’s illustration and in general with that of Massee in British 
Fungi and Lichens. 
A very closely related group is that which contains Clitocybe 
robusta and Clitocybe nobilis of Peck, Clitocybe Candida of Bresa- 
dola, and, in Quelet’s opinion, also Paxillus Lepista. These plants, 
as I have seen them growing among leaves in open woods in Wis- 
consin, can scarcely be distinguished from the form of Clitocybe 
nebularis shown in pi. lyS, f. A. B. They have a thick, white, 
convex to depressed pileus. The lamellae are adnate or sinuate to 
long-decurrent. The stems are usually short with much enlarged, 
often curved bases. The spores are, however, larger, 4-5 X 7~9 
in my specimens, 4-5 X 6-8 /<. and often slightly ochraceous in 
Clitocybe robusta, 4-5 X 7-8 fx. in Clitocybe nobilis, and 3 X 7 in 
Clitocybe Candida. 
PiLOSACE ALGERiENSis (Fries) Quel. 
In Mycologia, May, 1913, pp. 167-169, I gave reasons to show 
that the mushroom parasitic on species of Coprinus and described 
in this country as Panaeolus epimyces Peck and Stropharia copri- 
nophila Atk. was the same as that illustrated by Lanzi, Fung. 
Mang, pi. 6y, and identified as Pilosace algericnsis. During the 
past season. Dr. Mary S. Whetstone sent me several specimens of 
the plant found near Minneapolis, Minn., and from them I se- 
cured the photographs in pi. 178, f. C, D and pi. i7p,f.A. A com- 
parison with Lanzi’s pi. 67, f. b, c, d, leaves no doubt that his 
specimens were parasites and the description proves their identity 
with the species before us. The lamellae of the parasite become 
wholly free from the stem as the pileus expands. The substance 
of the stem is not continuous with that of the pileus as can be 
seen in pi. ijg, f. A, and the pileus easily separates from the stem. 
The plant has a universal veil which leaves the pileus and the base 
of the stem scaly, but there is no evident volva or annulus. The 
spores have a purple or brownish tinge rather than clear black. 
Hence the species is more naturally placed in Pilosace than in 
Panaeolus or Stropharia as was recognized by Fries, Quelet, and 
