426 AQUATIC PHYCOMYCETES 



3-12 lateral, simple or bifurcate spines, 4-15 u. in length; exit papilla 

 subapical, low and inconspicuous. Zoospores spherical, 3-3.5 p, with 

 a small (1.5 \i) golden-red globule; swarming in a vesicle for several 

 minutes before breaking out and swimming away. Rhizoidal system 

 intramatrical, monoaxial, arising from base of sporangium, richly 

 branched and extending for a distance of 80 jjl. Resting spores spher- 

 ical, 10-15 [i, oval, or slightly angular and spiny, 6-8 x 10-14 u., with 

 a reddish brown (2 pt), slightly uneven, crusty and almost verrucose 

 wall; containing numerous granules and globules; formed sexually by 

 the fusion of the contents of one or more 'male' (?) thalli with a 

 'female' (?) thallus; germination unknown" (Karling, he. cit.). 



Saprophytic in the exuviae of mayflies and other insects, Brazil; 

 United States. 



In its spinose sporangia this species is rather like Asterophlyctis. Here, 

 however, the spines are solid and do not alter appreciably the shape of 

 the sporangium, whereas in Asterophlyctis they are protuberances filled 

 with cytoplasm and give shape to the sporangium. Furthermore, in 

 Siphonaria petersenii no apophysis is formed. 



SOLUTOPARIES Whiffen 



Mycologia, 34:543. 1942 

 (Fig. 26 A-B, p. 422) 



"Thallus entirely extramatrical, monocentric. Sporangia developing 

 by enlargement of zoospore; rhizoidal system much-branched. Spore 

 discharge by dissolution of sporangial wall, liberating the zoospores 

 which swim away singly. Zoospore uniguttulate, posteriorly uniciliate. 

 Resting spores unknown" (Whiffen, he. cit.). 



Parasitic on Phycomycetes. 



This monotypic genus resembles Nowakowskia in the deliquescence 

 of the sporangium wall but differs from it in that the zoospores swim 

 away individually. 



The method of development of the thallus is characteristically 

 rhizidiaceous. It is not clear, however, either from the description or 

 figures, whether one or more rhizoidal axes typify the mature thallus. 

 Figures of the fully developed sporangium (which may not always bear 

 spines) indicate a single axis which is swollen beneath the sporangium. 



