CHYTRIDIALES 481 



The affinities of this genus have not been ascertained. Harant (1931 : 

 349) discussed a Nephromyces in the kidney of Ctenicella appendiculata. 

 Although Giard allied it to Catenaria it still remains a puzzling organism. 



Three species are described from France: Nephromyces molgularum 

 in Molgula socialis; N. sorokini in Listhonephrya, with regularly 

 pyriform sporangia; and N. roscovitanus in Anurella roscovitana. 



From what is known about these fungi it is evident that in this curious 

 habitat — the ductless kidney of certain, perhaps all, marine ascidians — 

 there may be a sort of commensalism which will repay careful 

 investigation. 



? SACCOPODIUM Sorokin 

 Hedwigia, 16 (6): 88, figs. 1-3 (lower plate). 1877 1 



Thallus tubular, without cross walls, branched, endobiotic with 

 extramatrical unbranched sporangiophores; sporangia in clusters of 

 from six to twelve at the tips of the extramatrical sporangiophores, 

 spherical or pyriform, 4-5 \x in diameter, without a discharge tube; 

 zoospores oblong, 1-1.5 \x (long?), emerging through an opening in the 

 sporangium, flagella not observed; resting spore not observed. 



A monotypic genus, represented only by Saccopodium gracile on 

 Cladophora, Asiatic Russia. 



Incomplete observations on a fungus on Cladophora collected in 

 Michigan have convinced the present author that there exists a chytrid 

 in which the sporangia occur in clusters at the tip of an extramatrical 

 tubular sporangiophore. There were certain differences, however, 

 particularly the apophysate character of the zoosporangia, which make 

 it impossible to identify the Michigan fungus with Sorokin's. 



GENUS OF DOUBTFUL AFFINITIES 



? Myceliochytrium Johanson 

 Torreya, 45: 104. 1945 

 Thallus polycentric, intra- and extramatrical, consisting of fine, my- 



1 In Arch. Bat. Nord France, 2: 23, 1883, there appears another figure (Fig. 21), 

 not found in the 1877 paper. 



