230 BOTANICAL GAZETTE [Marc# 
portoricenis Stev. on Eupatorium portoricense, 6031, Utuado. On Meliola 
pteridicola Stev. on Aneimia adiantifolia, 7269, Quebradillas, 8015, Utuado, 
7814, Rio Tanam4. On Meliola panici E. on Panicum glutinosum, 4801, 
Maricao; on Gramineae indet., 6796, Arecibo; on Lasiacis divaricata, 4208, 
Manati. On sn eliola Acsllinios Stev. on Casearia ramiflora, 6683, St. Ana, 
5844, San Ger 
While Skee ‘eanietions occur, it seems best to do as THIESSEN has done and 
regard the variants as of one species, and to unite the several species which 
were originally described as distinct. 
MICROTHYRIACEAE 
Members of this family abound on Meliola. The manner in 
which the mycelium of the parasite clothes the mycelium of the 
Meliola in a sheath is particularly striking. In some instances only 
single Meliola branches, portions of a colony, are so coated; in 
other cases the whole Meliola colony is covered. Sometimes the 
sheathing is limited to the host mycelium, but in older specimens 
the sheath expands into a continuous sheet or crust. The perithecia 
are very numerous, on young colonies as very small developing 
structures, on old ones as dense clusters of mature perithecia. 
Several species of Meliola have been described as having this 
crustose structure, and it is very probable that all such cases repre- 
sent merely parasitized colonies. Generic and specific determina- 
tion of the specimens is deferred for consideration in a separate 
paper dealing with the family. 
HYPOCHREALES 
Pseudonectria pipericola, sp. nov.—Mycelium closely appressed 
on the Meliola mycelium. Perithecia numerous, minute, 100-125 » 
in diameter, pink, with a few setae around the ostiole. Setae short, 
20-30 pw, obtuse, continuous; asci cylindrical, 505-7 u, 8-spored, 
1-seriate, sometimes oblique; paraphyses none; spores elliptical 
or oblong, obtuse, continuous, hyaline, 9-10 X 3-4 y. 
On Meliola tortuosa Wint. on Piper umbellatum, 5656 (type), Jajome Alto, 
3578, 3508, 3507, Afiasco, 7916, 7848, Rio Tanam4; on Piper marginatum, 7777; 
7842, Rio Tanam 
This is louie: related to Nectria mycelophila Pk. described on decaying 
fungi, but differs in having smaller spores, different shape of asci, and in the 
presence of setae around the ostiole. 
