298 THAXTER. 



a rather conspicuous "thin floccose membrane," and developed above 

 ground on mosses. 



If one compares with this account the characters of the other known 

 European types, none seem to correspond so closely as E. Ludwigii 

 Bucholtz (E. sphagnojMla Atk.) No other species is found, as far as 

 I am aware, growing on mosses above the surface of the ground, while 

 its yellow ellipsoid spores with uniform coarse granular contents, and 

 its conspicuous thin white superficial tomentum further distinguish it. 

 The vesicular swellings of its hyphae, which are sometimes conspicuous 

 among the larger spores, may further correspond to the "vesiculae 

 multo minores" of Link. 



Since for the reasons above indicated the reference by Bucholtz of 

 E. maUeola Hark, to E. pisiformis Link cannot be regarded as a possi- 

 ble solution of the difficulty, and since it is quite necessary to form 

 some reasonably plausible opinion as to what constitutes the Type of 

 the genus, I have felt it desirable to follow Krieger (1902) and the 

 earlier opinion of Bucholtz, in referring to E. pisiformis Link the spe- 

 cies more recently named by the latter (1912) Endogone Ludwigii. 



ENDOGONE Lk. 



Link (1809), p. 33. 

 Ghmus Tulasne (1845), p. 63. 



Hypogaeous or epigaeous: producing thick-walled isogamous or 

 heterogamous zygospores with or without specialized envelopes: 

 thick walled acrogenous non sexual chlamydospores: or thin-walled 

 sporangia. The three types, as a rule, produced separately in com- 

 pact groups, which may be single or associated in a common mass, 

 naked or surrounded by a variably developed pseudoperidium or 

 tomentum, and may form either a definite sporocarp or an indefinite 

 loosely coherent spore-mass. 



Type Species. 



Endogone pisiformis Link. 



(Figs. 1-7.) 



Link (1809), p. 33, Taf. II, fig. 52, a & b. Bucholtz (1902), p. 81, Tab. II, 



fig. 13 and V, fig. 4. 

 Krieger (1902), Fungi Saxonici, No. 1651. 



