28 ILLINOIS BIOLOGICAL MONOGRAPHS [194 



36. Hyalomeliolina guianensis Stevens n. sp. 

 [Figures 68 to 70, 105, 107.] 



Colonies superficial, black, circular, 2 to 4 mm. in diameter, amphi- 

 genous but mostly hypophyllous. Mycelium black, smooth, non-hypho- 

 podiate, uniform in diameter, 4//, slightly crooked, very sparsely, branched. 

 Perithecia few to many in each colony, buried in the mycelial tangle, 

 globose, black, 180 to 216^ in diameter, slightly rough: bearing many black, 

 simple setae, often over 1000^1 long, mycelium-like. Paraphyses numerous, 

 filiform, gelatinous. Asci persistent, 94 to 115 x 22 to 25^, 6 to 8-spored. 

 Spores inordinate, dark, elliptical-fusiform, 32 to 43 x 9 to 11^, unequally 

 3-septate (sometimes 5-septate), strongly constricted at the central septum. 

 Two end cells very small and much lighter in color than the others. Two- 

 celled when young. 



On Licania (?). 



British Guiana: Rockstone, July 17, 1922, 454 (type); Kartabo, July 

 24, 1922, 665. 



The mycelium forms a densely wooly colony and its filaments show a 

 tendency to twist together in a ropy fashion that is quite characteristic. 

 (Figure 69, 106). The spores with the strong constriction at the middle and 

 with the two end cells small and pale are quite distinctive. In general 

 appearance the fungus shows relationship with the genus Meliolina; in 

 the abundant, black superficial mycelium without hyphopodia,and in the 

 possession of setae. It differs from members of that genus in that its 

 spores are not like typical Meliola spores but have the terminal cells pale 

 to hyaline. 



Oplothecium Syd. 



Ann. Myc, 21:97, 1923. 



37. Oplothecium palmae Stevens n. sp. 



Fungus superficial, hypophyllous. Perithecia globular, sometimes tur- 

 binate, about 50 to 60/i in diameter. Perithecial setae 1-11 per perithecium, 

 short, about llju long, ending with 3-4 spikes each about 8/i long. Asci 

 many with numerous filiform, hyaline paraphyses, about 18 x 3.6/i, con- 

 taining 16 hyaline, single-celled, ovate spores. Mycelium very fine, form- 

 ing a tangled net-work. 



On Palm. 



British Guiana: Tumatumari, July 11, 1922, 134. 



This exceedingly interesting fungus appears to agree closely with the 

 descriptions and figures of Sydow drawn from material collected in the 

 Philippine Islands with the exceptions that no mycelial setae are observed 

 on our specimens while described as copious on Sydow's specimen. The 

 perithecial setae on our material are somewhat shorter, llju as against 

 10 to 18m, and their branches are also shorter, Sju ^s against 10 to 18^. Sydow 



