640 AQUATIC PHYCOMYCETES 



bly belong with the sporangia described by Couch and Dodge (1947) 

 from Keilin's type slide as C. quadrangulatus var. lamborni (p. 645). 



COELOMOMYCES PSOROPHORAE Couch 



J. Elisha Mitchell Sci. Soc, 61 : 129, pi. 1. figs. 5-6. 1945 



Hyphae 7.5-10 \i thick, not well developed but breaking up into 

 hyphal bodies which spread the infection through the host or develop 

 into resting sporangia; resting sporangia oval, frequently slightly flat- 

 tened on one side, rarely spherical, 37-67 by 46-1 19 \i when oval, 40-78 

 u. thick when spherical, wall 3-10 jx thick, consisting of two distinct 

 layers, the inner smooth, the outer with vast numbers of minute anas- 

 tomosing pits and a longitudinal groove, both wall layers deep brown; 

 germination not observed. 1 



In larvae of Psorophora ciliata, P. howardii, Aedes vexans, Culiseta 

 (syn. Theobaldia) inornata, United States. 



Variations in size of the resting spore on the different hosts are given 

 in Couch and Dodge (1947). 



The species is similar to Coelomomyces stegomyiae Keilin in wall 

 structure but differs from it in having the pits in the wall closer together 

 (less than "1.5 [x" apart as compared with "1.5-3 jx.") 



Couch (1945b) pointed out that the wall of the resting spore of this 

 species is the thickest known and is likely an adaptation to the very 

 transient aquatic environment of the host. 



Coelomomyces punctatus Couch and Dodge 

 J. Elisha Mitchell Sci. Soc, 63: 72, pi. 16, figs. 5-6. 1947 



Mycelium as in C [oelomomyces] dodgei: sporangia oval, slightly 

 flattened on one side, rarely subglobose, 32-41 X 42-75 fx, most 32-34 X 

 46-54 [x; wall 1.5-3.8 jjl thick, consisting of an outer, pale yellow to 

 brown layer and an inner hyaline layer, outer layer slightly thicker than 

 inner and set with minute rounded or elongated pits which are about 

 0.5 [j. in diameter when rounded and 0.5 X 4 u. or more when elongated, 

 about 2-4 jx apart; outer wall layer with a preformed longitudinal 

 groove extending half to two-thirds the length of sporangium on one 



1 Revised for this treatise by J. N. Couch. 



