MELANCONIACEAE 427 



MELANCONIACEAE 



Perithecia and asci absent ; conidia produced on a 

 more or less developed cushion or stroma formed beneath 

 the surface of the matrix, and becoming erumpent. 



Probably forms of higher species. 



Gloeosporium, Desm. — Sporodochium formed below 

 the epidermis of the host, discoid or pulvinate, at length 

 often erumpent, palhd or brown ; conidia ovate-oblong, 

 rarely oblong, hyaline, continuous, often extruded in 

 the "form of a sphere or tendril consisting of the conidia 

 held together by mucilage; basidia usually acicular, fas- 

 ciculate. 



Gloeosporium nerviseqiuum, Sacc, Mich., ii. p. 381. — 

 Pustules hypophyllous, erumpent, slightly prominent, brown, 

 then black, seated on brown, dry patches of the leaf, most 

 frequently following the larger veins, but sometimes form- 

 ing broad patches; conidiophores slender, 12-15x4-6 /*; 

 conidia oblong-ovate or pear-shaped, hyaline, 12-15 x 5"^ y-- 



On living leaves of Platanus orientalis, P. occidentalis, 

 also other species of Flatanus, and said to occur on oak 

 leaves in the United States. 



Distr. — Europe, United States. 



Gloeosporium ribis, Mont, and Desm. in Ktckx' Fl. 

 Crypt. Fland., ii. p. 95. — Spots minute, rounded, often con- 

 fluent, brown ; pustules epiphyllous, blackish, flattened ; 

 conidia hyaline, oblong, curved, apex obliquely pointed, 

 10-12 X5-6 /i. 



On living leaves of Ribes nigrum, R. rubrum, R. acicu- 

 lare, and R. grossulariae. 



Distr. — Europe, Asiatic Siberia, Australia, United States. 



