1921] The Thelephoraceae of North Carolina 169 



or more rarely on the ground and over mosses, etc., but a few are 

 parasitic as e. g., C. Stevensii and C. vagum (see below). We are 

 including C. lilacino-fuscum in Corticium for convenience, as it has 

 only a very narrow reflexed margin, if any. Burt treats it as a 

 Stereum. We include only a few of the numerous North Carolina 

 species. Burt has treated three parasitic species in Ann. Mo. Bot. 

 Gard. 5: 119. 1918. For important papers on the genus see Massee 

 in Journ. Linn. Soc. 27: 117. 1890; Wakefield, Trans. Brit. Myc. 

 Soc. 4: 113. 1913; Bourdot and Galzin, Bull. Soc. Myc. Fr. 27: 223. 

 1911 (this gives microscopic characters of the French species); 

 Bresadola, Ann. Myc. 1: 93. 1903; Bresadola, Fungi Tridentini 2: 

 36 & 57. 



Key to the Species Treated 



Not parasitic on leaves and twigs of fruit trees. 



Color deep blackish indigo blue when damp C. caeruleum (1) 



Color creamy gray with a lilac tint C. lilacino-fuscum (2) 



Color sordid whitish or cream to pallid yellowish or och- 

 raceous; surface cracking when dry into easily removable, 

 rather chalky scales C. scutellare (3) 



Color pale flesh both when wet and when dry, cracked when 



dry; on deciduous woods C. roseum (4) 



Color of mycelium and context deep orange, of hymenium 



pale sulphur; growing on grapevines C. Viticola (5) 



Color pure white, margin pulverulent or hypochnoid C. arachnoidewn (6) 



Color light slate when wet, yellowish gray when dry; tex- 

 ture wefty and resembling a mold C. vagum (7) 



Much like C. vagum in color and texture, but spores smaller 



and hyphae with clamp connections C. subcoronatum (8) 



Parasitic on apple, pear, or quince and forming a pinkish buff 



felt on the lower surface of the leaf and also brown sclerotia 



on the twigs C. Stevensii (9) 



1. Corticium caeruleum (Schrad.) Fr. 



Thelcphora indigo Schw. 



Plate 33 



Forming small or large patches up to 9 cm. long on twigs and 

 small branches of deciduous woods with the bark on; closely applied 

 to the bark, dull, when damp deep blackish indigo blue with more or 

 less gray tint, when dry blackish gray with often only a faint tint of 

 blue; the margin whitish, well defined, irregular. When well grown 

 the surface cracks into many small, unequal areas and has a thickish, 



