CHYTRIDIALES 533 



? Chytridium haematococci Braun 



Abhandl. Berlin Akad., 1855:45. 1856 



Known only from the figure of Vogt, in Desor (1844: 215-219, pi. 1, 

 figs. 4 a-f) (see Braun, 1856a). 



On Haematococcus, Switzerland (?). 



Mentioned by Fischer and Minden under Rhizophydium acuforme 

 (Zopf ) Fischer. 



? Chytridium minus Lacoste and Suringar 

 Nederl. Kruidk. Arch., 5 (2): 275, pi. A. 1861 



Sporangium subglobose or short-oblong, 11-14 \i high by 9-12 [x in 

 diameter, with a broad prominent apical papilla 1.3-2.5 ;jl high by 2.5-4 

 (x in diameter, wall smooth, golden, thin in the upper part but becoming 

 thicker toward the base, where it is prolonged into a single slender 

 extramatrical stalk (rarely two opposite stalks) which may encircle the 

 substratum; zoospores, method of escape, and resting spore unknown. 



On Ulothrix albicans (?), "Conferva rhynophila" Oedogonium sp., 

 Bulbochaete setigera (on the setae), stipes of Gomphonema navicella, 

 Holland. 



Tokunaga (1934b: 392, pi. 11, fig. 13) has referred to this species a 

 fungus found by him in Japan on oogonia of Oedogonium sp. He 

 characterized it as follows: "Zoosporangia epibiotic on sexual cells 

 of the host, solitary or aggregated, spherical or ovoidal, 12-14.4 \l in 

 diameter, with smooth membrane, an apical papilla and a broad, short 

 rhizoid; zoospores globular, about 2-4 \jl in diameter, with a single 

 cilium; resting spores endobiotic, up to seven in a host cell, spherical, 

 13.2-15.6 [j. in diameter, with smooth, thick membrane and a large oil 

 drop." The very different nature of the rhizoid as well as the shape of 

 the sporangium of the Japanese fungus makes it extremely doubtful 

 that it is identical with Lacoste's and Suringar's species. Further, since 

 an operculum has not been described as being present in either form, 

 the placing of them in Chytridium seems hardly justified. The broad 

 tubular rhizoid and the endobiotic resting spores of Tokunaga's fungus 

 make it appear closer to C. olla. Sporangia exactly like those figured 

 by Lacoste and Suringar have been found in Michigan on Mougeotia. 



