192 ROLAND THAXTER ON THE 



37 X 40,a-40 X 4:5/1. Conklioplwres arising from single cells of hyphae, simple, much swol- 

 len terminally, this swelling developing into a pecnliar piece, the basidinm, which is dis- 

 charged with the spore. Secondary conidta like the pi-imaiy, sometimes produced on a 

 cajjillary conidiophore. Resting spores, zygospores, spherical, with an irregularly pitted 

 or folded epispore; 25^5 /' in diameter; pale orange yellow or nearly colorless, sometimes 

 opaque from a dark brown incrustation of the epispore; produced by the conjugation of 

 two adjacent cells of a hypha, or of two conidial spores, through the absorption of the in- 

 tervening cross partition ; the union being preceded by the appearance of two finger-like 

 projections, one from either cell, which are applied to one another and, becoming septate 

 near their tips, persist as appendages to the mature sjiore. 



On the excrement of frogs. 



Ilahitat. Cambridge, Mass.; Europe. 



Beyond the hitherto unrecorded occuri-ence, in America, of this most interesting foi-m, 

 I have nothing new to add to the admirable monogi-aph of Eidam above cited. The 

 fungus appeared on the excrement of frogs kept in the biological laboi-atory at Cam- 

 bridge for purposes of dissection, and was obtained by filtering the water in which the 

 frogs were kept and placing the sediment in a tin box. I was unable at the time to make 

 artificial cultivations of the spores, by means of which the studies of Eidam were carried 

 out, and the figui-es given on i)late 21 are derived from specimens growing on the nat- 

 ural substratum of the fungus. It is probably for this reason that the production of zyg- 

 ospores seems to vary slightly from that described by Eidam, in that they appear to be 

 formed near the bi-anched extremities of very large and sparingly septate hyphae. The 

 early stages of the process I did not observe, and for a complete morphological history of 

 the species the beautiful plates of Eidam should be consulted. 



LIST OF PAPERS CONSULTED. 

 American. 



AiniiUR, J. C. A. On a new larvae Entomophthora. Bot. Gazette, Vol. xi, p. 14 (1886), with plate. 



B. Entomophthora rhytonomi in Bull. N. Y. Agr. Exp. Station, Jan., 1886, with cnt. 

 Bessky, C. E. a new species of insect-destroying fungus. Amer. Naturalist, Vol. xvii, pp. 1280 and 1286 (Dec, 1883). 



Peck, C. H. Massospora cieadina n. g. et sp. 31st Rep. of State Botanist of N. Y., p. 44 (1870). 

 In addition to the al30ve one or two catalogue references to E. Muscae and E. Calopteni. 



European. 



Bail. Ueljer Pilzcpizootien der forstverheerenden Raupen. Schriften der naturforsehenden Gesellschaft zu Danzig, neue 

 Folge, Band ii. Heft 2, Danzig (1869). 



BuAUN, A. Aigarum unicellularuni genera nova et minus cognita. Leipsic (1855), p. 105. 



BREfELD, O. A. Entwickelungsgeschichte der Empusa Muscae und Empusa radicans. Botanische Zeitung, xxvm, pp. 177 

 and 161 (1870). 



B. Uiitersucliuiigen ueberdie Entwicklung der Empusa Muscae nm\E. radicans. Abhandlung der Naturforseh- 

 enden Ge.sellschaft zu Halle, Bd. xii, Heft 1, p. 1 (1871). Plates. 



C. Ueber die Entomophthoreen und ihre Verwandteu. Botanische Zeitung, xxxv, pp. 345 and 368 (1877). 



D. Entomophthora radicans. Botanische Untersuchungen ueber Schlminelpilze, Heft iv, p. 97, Leipzig (1881). 

 Plate. 



B. Conidiohohis utriculosus und C. minor. Botanische Untersuchungen ueber Schimmelpiize, Heft vi, p. 35, 

 Leipzig (1884). Plates. 



