32 ILLINOIS BIOLOGICAL MONOGRAPHS [198 



of the Capnodiaceae it would be near Limacinia from which it differs 

 essentially in the character of its mycelium. 



TERISPORIACEAE IMPERFECTI 



Pycnodothis Stevens n. gen. 

 Fungus superficial, penetrating the epidermis by haustoria. Pycnidia 

 in stromata. Spores colored, 1-celled. Lilce Haplosporclla Speg. but super- 

 ficial. 



45. Pycnodothis tetracerae Stevens n. sp. 

 [Figures 78, 79, 108] 

 Stromata superficial, hypophyllous, surrounded by a scant superficial 

 mycelium. Stromata about 2 mm. in diameter, circular, flat, about 35ii 

 thick, usually bearing the pycnidia in a circle around a sterile center. 

 Pycnidia 30 to 40 or more on one stroma, black, globose, smooth, astomate, 

 about 90 to I08/i in diameter, wall 18/u thick. Spores ovate, honey-yellow, 

 continuous, 7 to 10 x 2/u. 

 On Telracera sp. 



British Guiana: Demerara-Essequibo R. R., July 15, 1922, 408. 

 In its strictly superficial habit with small haustoria like those of Meliola, 

 and spherical pycnidia with no ostioles this fungus has a typically peris- 

 poriaceous aspect and it doubtless is an imperfect form of such. 



CAPNODIACEAE 



PoLYSTOMELLOPSis Stevens, n. gen. 

 Mycelium superficial, yellow, gelatinous. Stromata superficial, non- 

 radiate, many-ostiolate, many-loculate, setose. Asci 8-spored. Spores 

 dark. 



46. PoLYSTOMELLOPSis MiRABiLis Stevens n. sp. 

 [Figures 80 to 87,109 to 113] 

 Stromata hypophyllous, superficial, irregular-oblong, 120 to 400 x 185 to 

 620;u across, 65 to 70/i thick, bearing numerous setae especially around the 

 edges. Setae black, 60 to 184m long, straight or irregular, curved, obtuse. 

 Ostioles numerous, 1 to 31, but usually about 10, about 2n in diameter, 

 Locules many, separated by a gelatinous matrix. Asci 8-spored. Paraphy- 

 ses filamentous, thin, irregular, gelatinous; spores yellow to brown, oval, 

 continuous, later muriform, 18 to 21 x 11/x. Mycelium superficial, yellow to 

 brown, non-hyphopodiate; mycelial setae few, black, 80 to 180m long, 7 

 to llju thick at base, irregular in contour. 

 On HirteUa sp. 



British Guiana: Kartabo, July 24, 1922,(547 (type); July 21, 1922, 

 4,?4;July 23, 1922, 595; Trinidad: Cumuto, August 16, 1922, 943. 

 On Coccoloba sp. 



British Guiana: Tumatumari, July 8, 1922, 40. 



