692 AQUATIC PHYCOMYCETES 



Among other water molds or forming minute pustules. On twigs, 

 Thaxter (F.) (loc. cit.), twigs of Populus trichocarpa, Graff (1928: 169), 

 apple, Sparrow (S.) (1932b: 293, pi. 8, fig. J), Emerson and Cantino 

 (1948), United States; fruits, Minden (1915: 605; 1916: 197, pi. 4, figs. 

 36-37), Germany; fruits of banana, Crooks (1937:226, fig. 11 H-I), 

 Australia; Pints fruits, Indoh (1940: 250, fig. 9 a-e), Japan; Water- 

 house (1942: 318, fig. 1, III), Great Britain; pear and tomato fruits, 

 Shen and Siang (1948: 189), China; fruit, Das-Gupta and John (1953: 

 167, fig. 2), rotting turnip, Lacy (1955: 209), India. 



In general aspect the thallus resembles that of Allomyces. Study of 

 the resting spores of the type material shows them to be faintly brownish 

 and minutely punctate (Fig. 47 D). 



Emerson and Cantino have secured this species in pure culture. 



Blastocladia tenuis Kanouse 



Amer. J. Bot., 14: 301, pi. 33, figs. 5-7. 1927 

 (Fig. 47 B, p. 682) 



Basal cell narrowly cylindrical throughout, if at all branched then only 

 once or twice near the middle, 300-1000 fx long by 30-60 \x in diameter, 

 wall thin (3-4 \l), golden brown, very brittle, sculptured throughout with 

 ridged markings, setae absent, holdfasts delicate, few, branched; spo- 

 rangia few, terminal at the apices of the basal cell or its branches, some- 

 what fusiform with beaklike apex, 27 [x long by 1 1 jx in diameter; zoo- 

 spores not observed; "oogonia" borne singly or in clusters at the apex 

 of the basal cell, irregularly pyriform or broadly dome-shaped, mature 

 resting spore not observed. (Modified from Kanouse.) 



Forming tufts on fruits of rose and Crataegus in stagnant water, 

 United States. 



Although the character of its wall distinguishes this species from 

 others of the genus further observations are needed on the reproductive 

 organs. 



Blastocladia glomerata Sparrow 



J. Linn. Soc. London (Bot.), 50: 456, text fig. 5 f-j, pi. 20, figs. 4, 9. 1936 



Basal cell stout, very broad at the base, often strongly tapering, 312- 

 364 [x long by 104-162 jx in diameter, rarely unbranched, usually giving 



