38 
Mycologia 
emphasized by the fact that both occurred on Fagiis antarctica, 
and in precisely the same narrowly limited localityd^ The speci- 
men under consideration belongs in the Leangium group of the 
genus Diderma, and I feel justified in uniting with it the form 
recorded by Dr. Spegazzini. 
Diachaea leucopoda (Bull.) Rost. Buenos Aires, Argentina, 
October, 1905. 
Diachaea leucopoda var. globosa List. Punta Arenas, Chile, 
February, 1906. A remarkably fine gathering of this rare form, 
showing both stipitate and sessile sporangia. 
Didymium Clavus (Alb. & Schw.) Rost. Llavallol, Argen- 
tina, April, 1906. 
Didymium melanospermum (Pers.) Macbr. Buenos Aires, 
Argentina, March, 1906. 
Stemonitis fusca Roth. Corral, Chile, December, 1905 ; 
Punta Arenas, Chile, February, 1906; Buenos Aires, Argentina, 
March, 1906. 
Stemonitis fusca var. dictyospora (Rost.). Afinegathering 
of this variety, showing an imperfect surface net and spores 
marked by raised bands forming a complete reticulation and a 
distinct border. In the size and habit of the sporangia this speci- 
men is precisely like normal S', fusca. The absence of a surface 
net, and the spore-sculpture, however, connect it with Rosta- 
finski’s S. dictyospora. Miss Lister applies to this form the name 
S', trechispora. This name originated with Berkeley and first 
appears in connection with a specimen collected in Venezuela by 
Fendler. A portion of this gathering is in the Curtis Herbarium 
at Harvard University and bears the label “Stemonitis trechi- 
spora, B. & C.” Under his S', dictyospora, Rostafinski (Mycet. 
Monog., App., p. 27) quotes three specimens, from Cuba, Ceylon, 
and Venezuela, respectively. The *first-named was presumably 
the type of the species, but I find no record of the existence of 
this specimen. The second appears to be properly referable to 
S', fusca var. rufesccns (cf. Lister, Mon. Mycet., Ed. 2, p. 145)- 
The third is the gathering represented in the Kew, British Mu- 
seum, and Curtis herbaria, and named by Rostafinski S', dictyo- 
spora. Although this specimen bears the manuscript name S'. 
12 Professor Thaxter informs me that there is only one wooded area readily 
accessible from Punta Arenas. 
