[Vol. 13 

 294 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Hypochnopsis ochroleuca Noack, Boletim do Instituto Agronom- 

 ico Sao Paulo em Campinas 9: 80. 1898. Hypochnus ochro- 

 leucus Noack in Sacc. Syll. Fung. 16 : 197. 1902 ; Stevens, Science 

 N. S. 26: 724. 1907; Stevens & Hall, Ann. Myc. 7: 49-59. 

 textf. 1-8. 1909. Not Corticium ochroleucum Bresadola, Fungi 

 Trid. 2:58. pi 167, f. 2. 1892. 



Vegetative mycelium forms on the twigs roundish or oblong, 

 chestnut-brown sclerotia 3-4 mm. in diameter, and also slender 

 mycelial strands white when young, becoming chestnut-brown, 

 running along the twigs and petioles to the leaves and fructifying 

 there; fructifications at first downy and barely visible, soon thick- 

 ening into a dirty pinkish buff, felty membrane covering the 

 whole under side of the leaf and frequently separable from it as a 



Fig. 2. C. Stevensii. From specimen from Trinidad, X 870. a, hypha; 

 al, basidium; a3, spores; aS, young basidium. 



whole by mere handling; hyphae hyaline or slightly colored, giving 

 their color to the fructifications, even, thin-walled, not incrusted, 

 not nodose-septate, 4J^-73^ y. in diameter; basidia scattered 

 along the hyphae on short lateral branches, simple, 11 X 7-8 [l, 

 with four short sterigmata; spores hyaline, flattened or slightly 

 concave on one side, 8-11 X 3-4 [i. 



Fructification 11 cm. long, 3-4 cm. broad, 45-60 (i thick, un- 

 broken over whole under surface of leaves; sclerotia 3-4 mm. in 

 diameter; mycelial strands J^-l mm. in diameter, many cm. long. 



On apple, pear, and quince, in Brazil and southern United 

 States, causing the leaves to dry and fall, and on Codiaeum in 

 Trinidad. 



This species differs from Corticium koleroga by having sclerotia 

 and thicker, darker-colored, and more felted fructifications which 

 are but feebly attached to the leaf and form an unbroken covering 



