OLIVE : MONOGRAPH OF THE ACRASIEAE. 
509 
This delicate species is well characterized by the small size of its 
sori. In an interesting specimen, found by Mr. A. F. Blakeslee on 
muskrat dung, luxuriant fructifications showed that some of the 
branches themselves bore several whorls of branchlets. That this 
doubly verticillate character was not constant, however, was proved 
by growing the form on a sterilized nutrient medium, on which the 
fructifications showed simply the normal method of branching. 
Polysphondylium album Olive. 
Proc. Amer. acad. arts and sci., vol. 37, p. 342, 1901. 
Sori and stalks white, the sori 100 iJi-200 fx in diameter. Spores 
oval, 2.5 jx—S fx by 4 /x—5.6 fx. 
On dung of toad from Eustis, Florida. 
Although the two forms above described have some features in 
common, their gross characters are such as to justify their being 
classed as separate species. The sori of P. album are not only larger 
but are usually more numerous in a whorl, hence its fructifications 
are more conspicuous ; moreover, the stalks of this species are rather 
constantly weak at the base, so that the fructifications lie close to 
the substratum in a characteristic fashion. 
Coenonia van Tieghem, 1884. 
Bull, de la soc. hot. de France, t. 31, p. 303-306, 1884. 
Sorus globular, borne at the summit of a stalk which is dilated 
into a sort of cupule, in which the sorus is supported. 
Coenonia denticulata van Tieghem. 
Bull, de la soc. hot. de France, t. 31, p. 303-306, 1884. 
Sorus yellowish ; stalk colorless, 2 to 3 mm. high, having a dilated 
base and expanding at the summit into a cupule which is finely 
toothed at its edges, each peripheral cell of the stalk bearing a 
tooth or papilla on its exposed side. Spores 6 />t-8 [x in diameter, 
with yellowish cell walls. 
On decaying beans. France. 
This remarkable form, so far as I am aware, has not been met 
with since it was originally described by van Tieghem. The fructi 
