MONOGRAPH OF TIIE LABOULBENIACE^E. 



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Cantharomyces pusillus Thaxter. Plate VII, figs. 11-14. 



Proc. Am. Acad. Arts and Sci. Vol. XXIX, p. 100. 



Perithccium becoming reddish brown, inflated just above the base, the distal portion conical, 

 tapering to a blunt symmetrical apex, borne on a rather short narrow stalk-cell bent towards 

 the appendage and separated from the pcrithecium by three small sub-triangular basal cells. 

 Receptacle consisting of a very small basal and a much larger rounded sub-basal cell, more or 

 less suffused with brown, which gives rise to the stalk-cell of the perithecium and the appendage. 

 Antheridial appendage consisting of a large squarish basal cell followed by the anthcridium 

 proper, which is primarily a large squarish cell, its outer half, or more, becoming divided by 

 anastomosing septa into numerous small cells, the inner portion also showing a division into two 

 or three larger cells ; the whole bearing terminally a series of usually three superposed flattened 

 cells, strongly constricted at the septa, and giving rise distally to from one to three simple cylin- 

 drical, nearly hyaline, sparingly septate branches, usually exceeding the perithecium in length. 

 Spores, 18 x 2 /z. Perithecia, 22-26 x 30-55 Total length to tip of perithecia, 80-85 /x, to tip 

 of appendages, 90-120 /jl. 



On Trogophloeus sp. York, Maine ; Waverly, Mass. 



This species is perhaps the smallest of the known forms of Laboulbeniaceas, and is some- 

 what difficult to discover and remove from the legs or elytra of its host, where, however, it is 

 not rarely found. Owing to its minute size, the detailed structure of the antheridium was not 

 plairdy made out, neither was any discharge of antherozoids noticed. Its structure corresponds 

 so closely, however, to that characteristic of the genus as emended, that there can be little doubt 

 of the correctness of its generic reference. It occurs more commonly on the legs or near the 

 tips of the elytra of its host, a small blackish staphylinid common on wet logs along the margins 

 of brooks or in wet rubbish caught in similar situations. 



EUCANTHAROMYCES, Thaxter. Plate V, figs. 25-27. 



Receptacle consisting of two superposed cells, giving rise on one side to a free stalked peri- 

 thecium, on the other to a free appendage. The appendage consisting of a basal and sub-basal 

 cell terminated by a compound antheridium. The antheridium formed from numerous small 

 cells, obliquely superposed in three rows, bordered externally by a sterile cell, and terminated by 

 a cavity from which the antherozoids are discharged through a short, irregular, finger-like 

 projection. 



This genus is based upon the peculiar structure of its antheridium, which appears to be dis- 

 tinctly different from the honey-comb-like body which occurs in Haplomyces and Cantharomyces, 

 as well as from the more simple form illustrated by Camptomyces, which is, probably, its 

 nearest ally. The material examined consists of but two type specimens, in one of which the 

 antheridium was in perfect condition, the terminal cavity being filled with antherozoids. It is 

 impossible to determine in this specimen whether all or only a few of - the small cells which 

 compose the antheridium are antheridial cells; but, from analogy with Dimorphomyces and Pey- 

 ritschiella, it seems probable that the majority of them arc ; and that the cells represented in 



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