REVISION OF ENDOGONEAE. 309 



outward. The chlamydospores are thus at first rather firmly asso- 

 ciated in grape-Hke clusters, which may be of definite rounded outline, 

 Figure 21, or longer or more irregular. This definite relation seems to 

 be more or less obscured in older specimens in which the h^phae tend 

 to break up, as in other species of the genus. It should be mentioned 

 that zygospores do not seem to be invariably associated with the 

 chlamydosporic form. The chlamydospores themselves are rather 

 uniform, commonly more or less spherical or but slightly longer than 

 broad, and when fully mature possess a relatively very thick wall, 

 surrounding a coarsely fatty contents. 



The species is most nearly related to E. vcsicuUfera, which seems 

 very clearly distinguished by the peculiar clavate empty vesicles 

 which are associated with the chlamydospores. In the grouping of its 

 spores it also bears some resemblance to E. fuegiana, which is at once 

 distinguished by its hard continuous gleba. 



Endogone vesiculifera nov. sp. 

 (Figs. 29-32.) 



Spore-mass loose in texture and without definite form, about 5-8 X 

 4 mm., incorporating more or less of the substratum (Sphagnum) and 

 some other foreign matter. Chlamydospores arising in groups, 

 rounded or more elongate, often nor clearly defined; pale yellowish, 

 spherical or slightly longer than broad, rather uniform, about 65 X 

 65 /x, the larger 80 X 70 /x : arising from fascicles of intricately woven, 

 branching, thick walled hyphae, and borne terminally on short radiat- 

 ing branches; associated with broadly clavate vesicular cells, 100-125 

 X 50-64 IX, which extend outward beyond them. 



In Sphagnum, Little Metis, P.Q. E. C. Jeffrey. 



The material of this form is somewhat scanty, although sections of 

 three different individuals are preserved. It resembles E. fasciculata 

 very closely, the chlamydospores being very similar in size and shape 

 and similarly grouped about a core of thick-walled hyphae. It is 

 readily distinguished, however, by the presence of numerous pear- 

 shaped or broadly clavate, nearly empty, thin-walled, sterile vesicular 

 structures which arise in company with the chlamydospores from 

 slender short branchlets. These bodies are very characteristic, and 

 although their origin is the same,"are b;\' no means ordinary chlamydo- 

 spores which haxe failed to develop. They are no doubt the homo- 

 logues of spores, but cannot be directly compared with the numerous 



