1926] 



BURT THELEPHORACEAE OF NORTH AMERICA. XV 215 



29. C. subgiganteum Berkeley, Grevillea 2: 3. 1873; Sacc. 

 Syll. Fung. 6: 632. 1888; Lyman, Boston Soc. Nat. Hist. Proc. 

 33: 151. pi. 18, f. 2-21, pi. 26, f. 137. 1907. 



Peniophora subgigantea (Berk.) Massee, Linn. Soc. Bot. Jour. 

 25: 142. 1889. Michenera artocreas Berk. & Curtis, Linn. Soc. 

 Bot. Jour. 10: 333. 1868; Sacc. Syll. Fung. 6: 653. 1888; 

 Patouillard, Soc. Myc. Fr. Bui. 7: 42. pi. b,f. 1-5. 1891; Essai 

 Taxon. 67. 1900; Peirce, Torr. Bot. Club Bui. 17: 305. pi. 110, 

 f. k-n. 1890; Lyman, Boston Soc. Nat. Hist. Proc. 33: 157. 

 pi. 18, f. 6-21, pi. 26, f. 137. 1907. An Corticium gilvidum 

 Bresadola, Ann. Myc. 18: 46. 1920? 



Type: in Kew Herb, and Farlow Herb. 



Basidiosporic stage broadly effused, adnate, thick, membrana- 

 ceous, separable in small pieces when moist, drying light buff to 

 light ochraceous-buff, even, glabrous, not cracked, the margin 

 whitish, sometimes buff when old; in section 500-1000 \l thick, 

 not colored, with the hyphae densely interwoven, about 2-2J/ y. 

 in diameter, not incrusted, not nodose-septate; no gloeocystidia ; 

 paraphyses with pointed tips; basidia large with 4 sterigmata 

 usually; basidiospores hyaline, even, globose or subglobose, 

 14-19 \l in diameter or 14-19 X 12-16 p. 



Chlamydosporic or Michenera fructifications disk-shaped, con- 

 cave, drying snuff-brown, cracked, the margin acute, thick, white 

 on its elevated side; in section 1-2 mm. thick, composed of a thick 

 basal layer of densely interwoven hyphae about 2 [i in diameter 

 which terminate in sporiferous ends and branches densely crowded 

 together in the concave layer at surface of the fructifications; 

 sporophores consist of each a single chlamydospore terminating 

 in a slender, flexuous, tapering terminal appendage up to 10-50 ja 

 long; chlamydospores ovoid, even, 12-20 X 10-15 \l. 



Basidiosporic fructifications 2-15 cm. long, 1-4 cm. wide; 

 Michenera fructifications 6-8 mm. in diameter. 



On bark of dead limbs of Acer rubrum, Magnolia, and Lirio- 

 dendron. In swamps in the Atlantic states from Canada to 

 Cuba. July to February. Occasional. 



Fructifications of the perfect stage bear some resemblance in 

 general aspect to those of C. portentosum but are readily dis- 

 tinguished by the much larger spores. When growing on the 



