304 THAXTER. 



may be from 350-1000 fi in diameter, more or less, the bright yellow 

 spores are closely packed and coherent, each surrounded by a thin, 

 but as a rule clearly defined, envelope of closely matted finer hyphae. 

 Penetrating the larger groups or areas, or separating the smaller ones, 

 vein-like wefts of coarser filaments, forming an irregular pseudo- 

 parenchyma, may be present. Figure 12, so that the general appear- 

 ance of the cut surface is not unlike that of one of the Tuberaceae. 



The individual spores. Figures 12-16, are often irregular from pres- 

 sure, and very variable in size and outline; subspherical or more often 

 longer than broad, elliptical, subpiriform or often elongate, 50 X 42- 

 150 X 90 fjL, the average about 90 X 65 ^t; the exospores about 5-6 fx, 

 becoming very thick, even 15 ju; t^e endospore comparatively thin, 

 about 1-2 fjL. The yellow contents consists of not always dense, 

 granular fatty protoplasm, usually associated with larger fatty masses 

 or globules; but in certain fully mature individuals, it appears to have 

 lost its color, becoming hyaline; while the exospore is greatly thick- 

 ened, Figure 14, intruding irregularly, somewhat as in E. incrassata, 

 and throwing the endospore into irregular folds. 



Although, owing to the mature condition of the specimen, the spore- 

 origins are for the most part shriveled or destroyed when freed from 

 the tenaciously adherent spore-envelopes, a sufficient number have 

 been isolated to satisfy me that two hyphal elements are involved in 

 spore-production, which are associated and differentiated much as in 

 E. lactiflua; although relatively smaller and less conspicuously difPer- 

 ent, one from the other, than in this species. In one instance, only, 

 Figure 13, has it been possible to determine with some exactness the 

 more normal appearance and relation of the two conjugating elements, 

 although many have been observed in which the remains of corre- 

 sponding structures were clearly traceable. 



In the type figured by Lloyd, the surface of the specimen is con- 

 siderably and irregularly roughened, pitted or lobed, the roughness 

 having apparently suggested the specific name. This tuberculate 

 habit does not, however, appear to be related to the presence of the 

 characteristic spore-groups, and is merely a modification of the earthy 

 covering. 



The species is more like E. pisiformis in the form and color of its 

 spores, but resembles E. lactiflua in its type of conjugation. In the 

 grouping of its spores and its yellow color it recalls E. viuUiplex, which 

 is nevertheless readily distinguished by the two discrete suspensor- 

 insertions which characterize this species. The grouping of the 

 spores is similar to that found in E. fuegiana, which, however, forms 



