1921] The Thelephoraceae of North Carolina 167 



1. Hymenochaete Curtisii (Berk.) Morg. 



Stereum Curtisii Berk. 



Plates 19 and 32 



Extensively resupinate on the underside of oak branches and 

 twigs, the free shelving margins extending about 4-8 mm. and form- 

 ing extensive wings on both sides of the branch; dorsal surface of 

 the caps zoned by ridges and colors, inherently fibrous, but not to- 

 mentose, rough, exactly the color of the oak bark (deep gray) except 

 for a pale cinnamon marginal zone. Flesh very thin and cloth-like, 

 quite pHable, not very strong, cinnamon color; distinctly stratified 

 under the microscope. Hymenium a deep rich cinnamon brown 

 (about argus brown of Ridgway) at all ages unless much weather- 

 worn, then paler; velvety from the close-set, short, curled and looped 

 hairs among which are scattered longer and stouter, straight, taper- 

 ing, red spines which project up to 60^. These last are very scattered 

 and are apt to be missed unless several sections are studied. They are 

 dark internally and most show a sheath-like hyaline thickening of 

 the wall, which is most conspicuous below. 



Spores (of No. 3830) white, smooth, curved, 1.5-2.8 x 6-8.2[x. 



Not rare on post oak limbs, where it extends as a complete cover 

 over the underside of dead branches for a considerable distance, 

 often several feet. This habit, with the deep, rich color and narrow 

 wings, will easily determine it. 



3805. On an oak twig, November 29, 1919. Young plants. 



3830. On post oak twigs, December 6, 1919. Photo. 



3842. On a fallen oak limb, December 7, 1919. 



3843. On a fallen post oak branch on campus, December 7, 1919. 

 3875. On a fallen oak limb, December 11, 1919. 



3899. On a branch of white oak, December 14, 1919. 



Common on the bark of white and post oaks. Curtis. 



2. Hymenochaete corrugata (Fr.) Lev. 



Plate 32 



Extensively effused and entirely adnate and not removable; sur- 

 face tuberculate, dull but not pulverulent, much cracked when dry, 

 color when wet slate-brown with a tint of clay, when dry a lighter 

 clay-brown except for the abrupt margin which is black on its very 

 edge; thickness of entire fructification about 225tx, the cystidia 

 pointed, brown, with a colorless sheath, projecting about 75^1 from the 

 surface. 



