326 THAXTER. 



in diameter, similar to those of E. macrocarpa, when young, but be- 

 coming quite opaque as they mature, owing to a blackening of the 

 exospore. This cannot apparently be referred to any of the described 

 species, although it is very similar to E. tenehrosa. The opacity of the 

 spore, however, seems due rather to the formation of a black encrusta- 

 tion than to a gradual darkening of the contents such as takes place in 

 E. tenehrosa. 



A second type found in the digestive tract of a m\Tiopod collected 

 in Eastern Tennessee, appears also to belong to an undescribed En- 

 dogone. The hyphae and spores are typical of this genus, the latter 

 browTiish yellow, mostly longer than broad, the greater diameter about 

 38-45 At, the walls not greatly thickened, peculiar from its slightly one- 

 sided insertion on the sporiferous hyphae. Its size is very near that of 

 E. microcarpa, but it differs in its much thinner wall, asymmetrical 

 insertion and more elongate outline. On the other hand it differs from 

 E. fulva in its smaller spores with relatively thicker walls. 



A third form, which approaches more nearly to some of the varia- 

 tions of E. viacrocarpa, was observed by Dr. ^Yeston while working 

 with water moulds in the Harvard Laboratory. It produced a rather 

 scanty groT\i;h, consisting of a single subdichotomously branching 

 hypha having all the characteristics of those peculiar to the genus. 

 This grew in water about a fly, attacked by Saprolegniae, and pro- 

 duced abundant spores rather thin-walled, subspherical, pale brownish 

 yellow, the larger 85-100 ix in diameter. It is quite probable that this 

 represents a form of E. macrocarpa, modified by its growth under 

 unnatural conditions. 



E. Tozziana Sacc. & Cav. has been referred to Leucogaster, a dispo- 

 sition which is confirmed by an examination of a portion of the type. 



SPHAEROCREAS Sacc. & Ell. 



Type species 



Sphaerocreas pubescens Sacc. & Ellis. 



(Figs. 79-82.) 



Saccardo & Ellis (1882), p. 582. 



Stigmatella pvhescens Saccardo (1886), p. 680. 

 Sderocystis pvbescens von Hohnel (1910), p. 399. 



This species was based on rather scanty material collected on leaves 

 and sticks at Newfield, New Jersey, by Ellis; a portion of which has 



