1072 AQUATIC PHYCOMYCETES 



together in certain regions. Branched external hyphae are commonly 

 seen. One thallus was found which did not become cut up into segments, 

 and produced a single broad external hypha. Infection of new hosts is 

 by the swollen end of an external hypha in contact with the wall. The 

 appressorium is very weakly developed and in many it could not be 

 found" (Canter, be. cit.). In Tetmemorus sp., Great Britain. 



EXCLUDED SPECIES OF ANCYLISTES 

 * Ancylistes cladocerarum A. Fritsch 

 Bull. Internat. Acad. Tcheque Sci. 2: 82, fig. 5. 1895 

 In Bosmina cornuta, Daphnia sp., Czechoslovakia. 

 Considered by Berdan (1938) to be too imperfectly known to be in- 

 cluded in the genus. Possibly a species of Aphanomyces. 



* Ancylistes miurii Skvortzow 

 Arch. Protistenk., 51 : 432, figs. 7-10. 1925 



"Intramatrical mycelium at first cylindrical, 7.4-12 [x, with hyaline, 

 granular protoplasm, consisting of 2-5 filaments, 210-245 jx long, in a 

 single host cell; becoming septate and divided up into 1 1-14 oval, bead- 

 like cells or segments, 17.6-19 [i in length. Exit hyphae swollen, 3.7-4.2 pi, 

 at their base and immediately inside of the host wall ; external hyphae or 

 infection tubes cylindrical and curved, 2.5-3 [x in diameter. Conidia un- 

 known. Conjugation scalariform; male gametangium cylindrical, female 

 gametangium barrel-shaped, 12-19.5 [i thick by 7.4-12 \i long. Resting 

 spore lying free, spherical, 7.4-9.5 \i, hyaline, smooth, thick-walled with 

 numerous refractive globules in the centre; germination unknown" (Ber- 

 dan, 1938, p. 409). 



Parasitic in Closteriwn sp., North Manchuria, China. 



Because of the beadlike nature of the thallus and lack of lateral con- 

 jugation, Berdan suggests that this may be a species of Myzocytium. A 

 study of the figures indicates beyond a doubt the correctness of her 

 statement. See M. megastomum (p. 978), with which it is considered 

 synonymous. 



* Ancylistes pfeifferi Beck 



Verhandl. Zoo.-Bot. Gesell. Wien, 46:233. 1896. Botan. Centralbl., 69: 11 



1897 



Closteriwn sp., coll. Lofgren, Brazil. 



Based upon a mixture of Ancylistes and Myzocytium megastomum 

 (seep. 1070). 



