342 PROCEEDINGS OF THE AMERICAN ACADEMY. 



cliaracter 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 nov. sp. 



Sori and stalks white, the sori lOO/x to 200ju in diameter. Spores oval, 

 2.5//-3/i X 4^-5. 6/t. 



On dung of toad from Eustis, Florida. 



Althouirh the two forms above described have some features in com- 

 mon, their gross characters are such as to justify their being placed in 

 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. 



CCENONIA Van Tieghem (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. Bot. de France, XXXI. p. 303-306. 1884. 



Sorus yellowish; stalk colorless, 2-3 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/a-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. 



LABYRINTHULE^ Cienkowsky. 



Organisms having two definitely recurring stages, — a vegetative stage 

 in which spindle-shaped or rarely spherical amoebffi, bearing usually 

 bipolar filiform pseudopodia singly or in tufts, may be either isolated or 

 combined by the union of the pseudopodia into colonies forming net-plas- 

 modia; and a fructifying stage, in which aggregations of individuals, com- 

 parable to pseudoplasmodia, form spores borne in stalked or sessile sori. 



