466 Bulletin 31*5 



cylindrical that is, not thickened toward the base nor attenuate toward 

 the top, with protoplasm greatly vacuolated, iio-150/i high, unbranchcd 

 and ending singly in sporangia; sporangia globose, 20/i in diameter, smooth, 

 membrane hyaline; spores globose, smooth, up to 3^ in diameter, hyaline, 

 from variously nucleate to not at all guttulate. 



Hab. Isolated from humous soil from Spanderswoud near Bussum, 

 Holland, March, 1901, Koning. 



Suborder Conidiophorae 

 Family Chaetocladiaceae 



Cunninghamella elegans Lendner, Bui. Herb. Boissierser. 2, 5: — . 1905; 

 Les Mucorinees de la Suisse, 159-161. figs. 38-jQ. 1908. 



Mycelium white (very slightly ashen), of two kinds: the first, in contact 

 with the substratum, is very compact and in old cultures it forms a cartilag- 

 inous layer in which it takes on a pseudo-parenchymatous appearance; 

 the other part, the aerial, is cottony; conidiophores erect, dichotomously 

 branched, with or without septa; apex of conidiophore terminating in a 

 very regular head; head round or slightly oval or pyriform, measuring as 

 much as 60/1 in diameter, minutely verrucose. Below the terminal head 

 is a branch or verticil of branches of variable number, each terminated by 

 a round head of mean diameter 18-20/x; conidia variable in size and shape; 

 those of the terminal head being larger, ovoid, minutely verrucose, 16 by 

 12-141JL (maximum 14 by 22^1); those of the lateral heads smaller and 

 more globular, 8-10/.'. in diameter, in color very pale blue ashen, falling 

 easily at maturity. 



Hab. From garden soil near Geneva, Switzerland, and Vuache, Savoie, 

 Lendner. 



Family Saprolegniaceae 



Aphanomyces laevis de Bary, Jahrb. Wiss. Bot. 2: 179. i860. Fischer, 

 Rab. Krypt. Flora Abt. 4, i : 358. 1892. Humphrey, J. E., The Saproleg- 

 niaceae of the United States with Notes on Other Species. Trans. Amer. 

 Phil. Soc. Philadelphia 17: 128-129. 1892. 



Colonies thick, up to i cm. broad, very tender and inconspicuous, with 

 long, unbranched, very weak and thin chief branches, which are only 

 5-7^1 thick. Zoosporangia terminal, thread-like, often very long (up to 

 2 mm.), containing only one row of swarm spores (20-100, mostly 100, swarm 

 spores), never or only seldom renewed by proliferation after the liberation 

 of the swarm spores. Swarm spores relatively large, up to 20 fx, long. 

 Oogonia terminal on short lateral branches, globular, 25-35^ in diameter, 

 with entirely smooth membrane. Antheridia abundantly developed on 

 all oogonia, large clavate-cylindric, on short branches of androgynous or 



