1921] The Thelephoraceae of North Carolina 153 



Galzin, Bull. Soc. Myc. Fr. 28: 349. 1912; Lloyd, Mycological 

 Notes No. 62: 926, PI. 147, figs. 1666-1681 and PL 148, figs. 1682- 

 1688, and PI. 145, fig. 1652. 1920. For morphology and cytology of A. 

 amorphus see Am. Jom-n. Bot. 7: 445, Pis. 31-33. 1920. 



Key to the Species Included 



On bark of living trees. 



Spores very large, not smaller than 12 X 15m- 



Flesh pliable and leathery when wet, margin free and up- 

 turned all around A. Oakesii (1 ) 



Flesh hard and woody even when damp, margin not free or 

 scarcely so. 

 On post oak or white oak; spores oval-elliptic, minutely 



punctate A. candidus (2) 



On elm; spores subspherical to short-oval, very minutely 



punctate (some appearing smooth) A. candidus var. 



sphaerosporus (3) 

 On ash; spores subrectangular, set with a few large, 



blunt spines A. macrodens (4) 



On cedars; spores subspherical to short-oval, covered with 



minute, slender spicules A. nivosus (5) 



Spores not larger than 7 X 12^1. 



On maples (said also to grow on ash, elm and white oak); 



thinner and smaller than any of the above, irregular A. acerinus (6) 



On dead shoots of blackberry, lilac, etc. Spores 7. .5-11 X 



]4-19n A. botryosus (7) 



1. Aleurodiscus Oakesii (B, & C.) Cooke. 



Plate 30 



Small, saucer-shaped or shallow cup-shaped, rather broadly 

 attached by the center, the margin quite free all around and curved 

 up when damp, incurved over the hymenium when dry, the exposed 

 outer (lower) surface white and fibrous, especially on margin and near 

 attachment so as to appear tomentose; hymenium even or a little 

 wavy, minutely pulverulent, pale avellaneous (light fawn brown) 

 both when wet and dry. Flesh about 0.5 mm. thick, leathery and 

 pliable when wet, rigid when dry. 



Spores ovoid, white, minutely papillate-warted, 12-16 x 15-20[x. 

 Basidia very large, 15-16tJi. thick with 4 large sterigmata. Para- 

 physes often moniliform by constrictions mostly with prong-like 

 short branches at the tip or lower down. 



The plant resembles in form a small Stereum attached by the 

 center. Single plants are about 3-5 mm. broad when damp and ex- 

 panded, but they fuse more or less completely when they touch, so 



