OP ARTS AND SCIENCES. 181 



must therefore be considered the distal portion of the receptacle from 

 which the appendages proper arise. The antheridia appear to be 

 represented by certain short hyaline branches of the inner appendage, 

 but their exact nature cannot well be made out from the dried ma- 

 terial. The trichogyne is at first terminal and is well developed. 



CoRETHROMTCES Cryptobii, Thaxtcr. 



Specimens occurring on Cryptobium bicolor Grav., from Pennsyl- 

 vania, show that the mature perithecium is very elongate, exceeding 

 the tips of the appendages by about half its length, subcylindrical, 

 slightly inflated at the base, the apex abruptly conical, blunt symmet- 

 rical : borne on a stalk consisting of a single basal, two sub-basal, and 

 a few small distal cells, on which the perithecium is seated. Perithe- 

 cium 240 X 38 /i, its stalk 145 X 26 /x; basal cell hyaline brown at 

 base, the remaining cells together with the perithecium reddish brown. 



Corethromtces setiqerus, nov. sp. 



Perithecium yellowish, slender, slightly tapering, bluntly pointed : 

 basal cell of stalk hyaline to its base, long ; sub-basal cells squarish- 

 Appendages arising from the distal and sub-distal cells of the recep- 

 tacle, consisting of two or three rounded basal cells, which bear 

 numerous long straight cylindrical septate deep brown branches, the 

 whole curved slightly outwards and forming a crest-like structure. 

 Receptacle consisting of five superposed cells, the four distal ones 

 more or less rounded or squarish, deeply blackened externally, bent 

 outwards at an angle of 45-60°, the perithecium with its stalk cells 

 continuing directly the axis of the basal and sub-basal receptacle cells. 

 Perithecia 110 X 35 /x. Spores (measured in perithecium) 30 X An. 

 Total length of appendages 200 fx or more. Two basal cells of recep- 

 tacle 35 X 15 /x. Total length from base to tip of perithecium 200- 

 220/01. 



On thorax of Lathrohium nitidiilum Lee, Massachusetts. 



This is a much smaller species than 0. Cryptobii, at once distin- 

 guished by its short primary and very long secondary appendages, the 

 series of which recalls that of Laboulbenia cristata. 



Corethromtces jacobinus, nov. sp. 



Perithecia (not fully mature) faintly brownish, nearly hyaline, 

 tapering to a blunt apex. Appendages consisting of two more or less 

 suffused basal cells, from which arise several stout branches them- 



