REVISION OF ENDOGONEAE. 317 



Endogone arenacea nov. sp. 



(Figs. 38-40.) 



Spores associated in an indefinite mass through which the material 

 of the substratum (sand) is uniformly and copiously distributed, the 

 whole bound together in an irregular crust-like aggregation, by a 

 loose white mycelium of occasionally septate hyphae. Spores, 

 chlamydospores, rather uniformly spherical, thick-walled, brownish 

 yellow, about 70 fx in diameter (65-75 fj.): the walls 5.5-6.5 /x; with 



koH, S M. 



Near margin of brook, Maraval Valley, Port of Spain, Trinidad, 

 B. \Y. I., in sand under trash. 



This species was found at no great distance from the gathering of 

 E. fulva, hereafter mentioned, from the same locality. The spore- 

 mass has the appearance of a bit of caked sand, about 16 X 15 mm. 

 and about 4 mm. thick when dry. The rather scanty mycelium is 

 visible with a lens over the surface, but it would be unlikely to attract 

 attention, and was preserved and examined almost by accident. The 

 mass is less characteristic and more amorphous than that of any other 

 species, unless it be E. vudtiplcx. The spores, although they show 

 occasional variations in outline and slight differences in size, are 

 exceptionally uniform in these respects as compared with other 

 chlamydosporic types, and are usually quite spherical. The very 

 thick endospore is not continuous, and no septum is present : the thin, 

 often hardly distinguishable, exospore is usually externally roughened 

 by adherent more or less granular disorganized material. The hyphae 

 are much bent and tangled between the spores and sand grains, and 

 the spores often arise from a very short branch. Their non-sexual 

 origin is, however, unquestionable. When treated with potash a 

 rather characteristic smoky stain appears about their insertion. 

 Figure 40. The fatty contents is apt to develop acicular fat crystals, 

 Figures 38, 40. The hyphae show the usual irregularities seen in 

 other species of the genus, and are very rarely septate. 



Endogone canadensis nov. sp. 



(Figs. 52-55.) 



Sporocarp subspherical or irreguhirly lobed; soft, but rather firmly 

 coherent, with a rather well defined whitish (?) peridial layer: gleba 

 dark brown. Spores distinguished by a septum, ovoid to ellipsoid, or 



