THE THELEPHORACEAE OF NORTH AMERICA. XP 



TuLASNELLA, Veluticeps, Mycobonia, Epithele, and 



Lachnocladium 



EDWARD ANGUS BURT 



Mycologist and Ldbrarian to the Missouri Botanical Garden 



Professor in the Henry Shaw School of Botany of 



Washington University 



TULASNELLA 



Tulasnella Schroeter, Krypt.-Fl. Schlesien 3: 397. 1888; 

 Juel, K. Svenska Vet.-Akad. Bihang till Handl. Afd. III. 

 2312: 21. 1897; Arkiv for Bot. 14I: 8. 1915; Sacc. Syll. Fung. 

 14: 234. 1899. — Prototremella Patouillard, Jour, de Bot. 2: 

 267. 1888. — Pachysterigma Johan-Olsen in Brefeld, Untersuch. 

 Myk. 8: 5. 1889; Engl. & Prantl, Nat. Pflanzenfam. (i : 1**) : 

 117. 1898. 



Fungi with the aspect of Corticium and with simple ovoid to 

 globose basidia but having very large sterigmata, each of which 

 bears a spore. 



The organs which have the position of sterigmata — and are so 

 called in the original definition of Tulasnella which I have fol- 

 lowed — are different from all other sterigmata which I have seen 

 by their spore-like form and greatly constricted connection with 

 the body of the basidium as compared with the diameter of the 

 rest of the sterigma. These organs resemble usual sterigmata 

 in being permanently attached to their basidia. Juel, loc. cit., 

 gives cytological reasons for regarding these organs as basidio- 

 spores rather than as sterigmata, but basidiospores not sep- 



1 Issued March 2, 1920. 

 Ann. Mo. Bot. Card., Vol. 6, 1919 (253) 



