BLASTOCLADIALES 693 



rise distally to from two to six broad somewhat clavate branches 1 95 — 

 556 [x long by 52-111 \x in diameter, setae branched or unbranched, 

 holdfasts stout, branched, whole thallus exclusive of holdfasts and setae 

 693-1020 [x long; sporangia occurring in dense clusters at the tips of the 

 branches, predominantly broadly ellipsoidal, often slightly curved, rest- 

 ing on a truncate, collar-like base, 63-169 \x long (majority 88-100 \i) 

 by 34-63 u. in diameter (majority 42-52 \x), ratio of length to width 1.3- 

 2.3: 1; zoospores spherical, 10 \x in diameter, posteriorly uniflagellate; 

 resting spores borne among the sporangia, nearly spherical, ovoid or 

 somewhat elongate, basally truncate, 39-52 \x long by 36-49 \l in diam- 

 eter (average 46 by 39.6 \i), wall thick, punctate, dark brown, germina- 

 tion not observed. 



Forming large coarsely granulated pustules on twigs of Aescuhis sp., 

 Sparrow (S., B.M. ), tomato fruits, Waterhouse (1942: 318, fig. 1, II), 

 Sparrow (1957a), Great Britain. 



Certain forms of Blastocladia pringsheimii figured by Minden (1916 : fig. 

 15) and Lund (1934: fig. 18b) resemble B. glomerata to a degree. Though 

 its resting spore is practically identical with that of B. pringsheimii, B. 

 glomerata differs from this species in the shape of the basal cell and more 

 especially in the ratio of length to width of the sporangia (1.3-2.3: 1 as 

 compared to 6.4-8: 1). 



Blastocladia truncata Sparrow 

 Mycologia, 24: 293, pi. 7, rig. G. 1932 



Basal cell narrowly cylindrical, unbranched, slightly expanded at the 

 apex, 250-286 \x long by 7.7-26 jx in diameter; setae lacking, holdfasts 

 slightly branched; sporangia borne on the apex of the basal cell, trun- 

 cate, nearly as broad as long, 10.4-15 ;x long by 10.4-12 \l in diameter, 

 appearing more acuminate after discharge; zoospores spherical, 3.5 ;x 

 in diameter; resting spores formed. 



Occurs mixed with other water molds in pustules on fruits of apple, 

 United States. 



Although this species does not appear to be simply a form of Blasto- 

 cladia pringsheimii, further observations on it and particularly on the 

 character of the resting spores would be desirable. Waterhouse (1942) 



