THE THELEPHORACEAE OF NORTH AMERICA. IX^ 



Aleurodiscus 



edward angus burt 



Mycologist and Lihraria/n to the Missouri Botanical Garden 



Professor in the Henry Shaw School of Botany of 



Washington University 



ALEURODISCUS 



Aleurodiscus Rabenhorst, Fungi Eur. Exs., 1824 (without 

 diagnosis). 1874; Hedwigia 13 : 184 (without diagnosis). 1874; 

 Schroeter, Krypt.-Fl. Schlesien 3 : 429. 1888; Engl. & Prantl, 

 Nat. Pflanzenfam. (1.1**) : 120. 1898; Patouillard, Essai 

 Taxon. Hym. 52. 1900; v. Hohn. & Litsch. K. Akad. Wiss. 

 Wien Sitzungsber. 116 : 793. pi. 1-4. 1907 ; Bourd. & Galz. Soc. 

 Myc. Fr. Bui. 28 : 349. 1913. 



Fructifications resupinate, sometimes with margin free all 

 around and somewhat saucer-shaped, rarely dimidiate and 

 attached by the base, drying coriaceous; hymenium pulver- 

 ulent; paraphyses noteworthy, modified into forms such as 

 moniliform, or racemose by presence of short lateral branches 

 these paraphyses are sometimes called dendrophyses ; 

 granular or crystalline matter often in great quantity between 

 the basidia, paraphyses, and hyphae of the fructification; 

 basidia simple, usually large and with four large sterigmata ; 

 spores simple, usually large, with colorless cell wall. 



The type species is Aleurodiscus amorphus (Pers.) Rabenh. 

 originally published as Peziza amorpha by Persoon, then 

 transferred to Thelephora by Fries when known to be a basid- 



^ Issued September 20, 1918. 

 Ann. Mo. BOT. Gard., Vol. 5, 1918 (1'7) 



