500 PROCEEDINGS : BOSTON SOCIETY NATURAL HISTORY. 
height, by 150 /u,-400 /x broad. Fructifications varying in color from 
whitish to dirty yellowish according to the character of the substra¬ 
tum and the dryness of the sorus. Pseudospores usually irregularly 
spherical, about 4 fx-S fx in diameter. 
On dung of horse, cow, pig, mouse, muskrat, etc. Maine; 
Massachusetts ; Alabama; Indiana; Porto Rico. 
This organism, which has conspicuous fructifications so large that 
they may readily be seen with the naked eye, is evidently of com¬ 
mon occurrence, for it has been met with quite frequently on fresh 
cultures of various kinds of dung. On the dung of chicken and 
goose, I have obtained several times a form which shows at least 
varietal distinctions from G. mdgaris. The fructifications, for 
example, are usually larger and the pseudospores are somewhat 
smaller than in the type. While the pseudospores of this form are 
usually spherical and 3 /x-5 \x in diameter, they may be oval and 4 jx 
-6 p, by 5 [x-1 jx ; the sori of the variety, further, may be either 
sessile or short stalked and 200 /x-500 ix by 200 /x-700 /x. 
Although GuttuUna aurea of van Tieghem may prove to be iden¬ 
tical with the above species, with which it agrees in the measure¬ 
ments of its resting bodies, the fact that, according to the original 
description, this organism possesses resting bodies which are charac¬ 
terized as “ spores,” having a golden yellow color, renders it improb¬ 
able that the two forms are the same. 
Guttulinopsis stipitata Olive. Plate 5, fig. 25-26. 
Proc. Amer. acad. arts and sci., vol. 37, p. 336, 1901. 
Sori yellowish white, long stalked, the stalk composed of indi¬ 
viduals similar to those of the head. Sorus about 3 mm.-1.2 cm. 
high; the stalk about 800 /x long, the head 250 fx in diameter. 
On dung of dog. New Haven, Conn. 
This species, the largest representative of the genus, has been 
met with but once, and is founded on a mounted specimen and dried 
material collected at New Haven some years ago by Dr. Thaxter. 
It is especially characterized by its long stalk, which, unlike that of 
the following form, is composed of cells similar in shape and size to 
those of the sorus. 
