1924] 



BURT — THE THELEPHORACEAB OF NORTH AMERICA. XIII 9 



and the hymenial layer; hymenium inferior, nearly even; no 

 cystidia; basidia simple; spores hyaline, even, 5-7^ X 3-4 (x. 



Dried fructifications about 2]/i mm. long; pileus 1-13^ mm. 

 long, 1 mm. broad; stem 1 mm. long, 120 [x in diameter. 



On dead wood in Cuba and on Nostoc coating rocks in Trinidad. 



Specimens examined: 

 Cuba: C. Wright, 3, type (in Curtis Herb.). 

 Trinidad: Maravel Beach, near Port of Spain, R. Thaxter (in 



Farlow Herb.). 



CYTIDIA 



Cytidia Quelet, Fl. Myc. Fr. — . 1888; Patouillard, Essai Tax. 



. . . ; Bourdot & Galzin, Soc. Myc. Fr. Bui. 26: 222. 

 1910; Rea, Brit. Basid. 697. 1922. — Lomatia Karsten, Finska 

 Vet.-Soc. Bidrag Natur och Folk 48: 403. 1889. — Auriculariopsis 

 R. Maire, Rech. Cyt. Tax. 102. 1902, and Soc. Myc. Fr. Bui. 18: 

 Suppl. 102. 1902; Sacc. Syll. Fung. 21: 423. 1912. 



Fructifications coriaceous-gelatinous, cup-shaped, sessile, scat- 

 tered or crowded, often confluent; hymenium even at first, 

 becoming more or less wrinkled or veined; basidia simple; spores 

 white. 



Cytidia is a genus whose few species have usually been included 

 in Corticium but differ from this genus in being resupinate by 

 the middle only, with margins free as in some species of Stereum. 

 The configuration of the hymenial surface is decidedly merulioid 

 in our single indigenous species. 



Key to the Species 



White or nearly so, pubescent or toraentose /. C. flocculenta 



White villose; hymenium blood-red S. C. salidna 



Deep olive-buff to drab; hymenium becoming coarsely merulioid . ..S. C. tremellosa 



1. Cytidia flocculenta (Fr.) v. Hohn. & Litsch. K. Akad. 

 Wiss. Wien Sitzungsber. 116: 758. 1907; Wiesner Festschr. 

 Wien 61. 1908; Bourdot & Galzin, Soc. Myc. Fr. Bui. 26: 222. 

 1910; Rea, Brit. Basid. 697. 1922. Plate 1, fig. 7. 



Thelephora flocculenta Fries, Elench. Fung. 1: 184. 1828. — 

 Corticium flocculentum Fries, Epicr. 559. 1838; Hym. Eur. 647. 

 1874; Sacc. Syll. Fung. 6: 605. ISSS.—Cyphella ampla L6veill4, 

 Ann. Sci. Nat. Bot. III. 9: 126. 1848; Fries, Hym. Eur. 662. 



