SPOROTRICHEAE 791 



TRICHOSPORIUM 



Trichosporium Fries, Summa Veg. Scand. 492, 1849. 



This genus was first described by Fries in his Systema Orbis Vegetabilis 306, 1825, 

 without adding species, hence was not valid at that date. He failed to recognize it in the 

 Systema Mycologicivm in 1829, but did in the Summa. Since the description is most com- 

 plete in the Systema Orbis Vegetabilis, it may be considered here. It was defined as Flocci 

 varii, septati, sporidiis e floccis enatis nudis adspersi {Saxicola, truncicola, colore varia). 

 Since it was reported as found on rocks, it is probable that some lichens were also included 

 here. In no place does Fries carefully distinguish it from existing genera. In 1849 he 

 characterized it as Sporae simplices, nee septatae, solitariae, reliqioa prioris Trichothecium. 

 He recognizes twelve species, all previously described, but it is almost impossible to select a 

 type species, as none is described here. Saccardo, Michelia 2: 125, 1880, redefined the group, 

 taking his T. nigricans as the type. In this sense, it has been used as the black-spored 

 analogue of Sporotrichum, or, as defined by Lindau 1906, as the black-spored analogue cf 

 Aleurisma. In this sense, it is equivalent to the use of Glenospora of Vuillemin and later 

 medical authors, not of Berkeley & Curtis which is an imperfect stage of Septobasidium 

 (Couch 1933), a wholly unrelated fungus. 



Hyphae repent, irregularly branched, brown or pale; conidia (or aleuro- 

 spores) terminal or lateral on the hyphae or ultimate branches spherical or 

 ovoid, smooth or slightly rough, brown or occasionally almost hyaline. 



The whole group needs monographing before one can be certain of the 

 proper name to apply to these species. 



Key to Species 



Gelatin liquefied ; from generalized infection. T. Ga/nimeli. 



Gelatin not liquefied; from local infections. 



Aleurospores 3 x 5m; from lesions of cornea. T. graphii. 



Aleurospores 5-6.5 x 6.5-9fi; from mycetoma with black grains. 



T. hhartoumensis. 

 Aleurospores, 6-7/j. in diameter; from gummatous nodular lesions in thorax. 



T. Mantegazzae. 



Trichosporium Mantegazzae Pollacci, Riv. Biol. 4: 318-328, Pis. 1, 2, 1922; 

 Bolognesi & Chiurco, Micosi Chirurg. 888-895, 1927. 



Isolated from gummatous nodules in swellings of the thorax. For case 

 history see Mariani, 1923. Pathogenic for laboratory animals. 



Sterile hyphae repent, branched, subhyaline then fuscous, and finally 

 black, 7-8/n in diameter. Vegetative hyphae moniliform, black. Chlamydo- 

 spores numerous. Conidiophores ascending or repent, septate, simple or 

 branched, roughened, brown, long, slender, bearing numerous lateral conidia 

 which are spherical or ellipsoid, easily separable, more or less in whorls, 

 fuliginous, black, somewhat papillate, 6-7/x in diameter. Optimum tempera- 

 ture 15° -20° C. 



Colonies small, discrete, grayish, becoming greenish gray and finally- 

 black, confluent, covering the whole surface of the medium. Surface of colony 

 velvety, wrinkled, rugose, mammillate, not dry or shining, adherent. Ring 

 formation in glucose broth, submersed mycelium not blackening, spores 6.5 x 



