REVISION OF ENDOGONEAE. 333 



SCLEROCYSTIS COCCOGENA (Pat.) von H. 



(Figs. 86-87.) 

 von Hohnel (1910), p. 390. 



Ackermannia coccogena Patouillard (1902), p. 183, figs. h-j. 

 Sphaerocreas coccogena von Hohnel (1909), p. 401. 



I am indebted to M. Patouillard for a very small fragment of this 

 species, which was collected by Ackermann in company with Endogone 

 lignicola Pat., growing on rotten wood, the locality being the Plateau 

 des Rivieres, Martinique, and the date of collection June, 1901. This 

 fragment shows a small portion of the crust or covering which sur- 

 rounds the sporocarps, and three or four of the latter, which are fully 

 mature, but still attached to it. 



Judging from the original figures and description, the "stroma" of 

 this species is more definitely circumscribed and thicker (6-8 mm. by 

 4 mm. thick) than that of S. Diissii, resembling closely the spore-mass 

 of some Endogone, and covered by a more even and clearly differ- 

 entiated pseudoperidial layer. The small fragment of this layer which 

 I have examined, is composed of rather loose coarse septate hyphae, 

 the segments of which are irregular and do not, form a coherent pseudo- 

 tissue of giant cells as in the preceding species. 



The sporocarps are similar in form and appearance to those of S. 

 Dussii, but somewhat larger, 400-675 n in greatest diameter. The 

 spores, which are similar in their origin and arrangement, are some- 

 what smaller, their average dimensions being about 100 X 40-50 n. 

 The sporocarps themselves are at once distinguished, however, by the 

 presence of numerous small spherical chlamydospores. Figure 87, 

 similar to those of Endogone, which are formed terminally in the 

 tomentum which covers the intricately woven superfical layer 

 (Fig. 86). 



In its thicker and more clearly circumscribed stroma, and more 

 definite pseudoperidium, in its larger sporocarps and the production 

 on their surface of spherical chlamydospores, and in the apparent 

 absence of a lysigenous pseudotissue of large thin-walled hyphal 

 segments, this species seems to-be clearly distinguished. 



