636 NOTICES OF BRAZILIAN FUNGI. 
Pileus 1 inch broad, plano-umbilicate, extremely thin and 
delicate, so that the pores are visible through it, even, not the 
least scrobiculate, zoneless ; margin laciniato-pilose. 
Stem 12 inch high, $ of a line thick, rufous, flexuous, 
smooth, with a few adpressed silky fibrille. 
Pores small, 1-80th of an inch in diameter, angular, nearly 
equal, much longer than the substance of the pileus ; disse- 
piments extremely thin. The pores and pileus afe of a more 
or less ochraceous tint. In the recent plant, they are probably 
nearly white. 
This elegant species is allied to P. Tricholoma and 
Guianensis, but it differs from both in its less coriaceous 
substance, and from the former, in its smooth, not velvety 
stem. 
Polyporus gracilis, Kl., again agrees with it in many points, 
and it has certainly aciliated margin, though this character is 
so obscurely marked, that I had overlooked it, until my 
attention was called to the point, on comparing it with Pol. 
Guianensis, and P. Tricholoma. The pores, however, are ex- 
tremely minute, and the stem is not above half as thick, and 
the pileus but half an inch broad. 
19. P. (Mesopus) calcigenus, n. s., pileotenui coriaceo orbi- 
culari umbilicato, margine plus minus depresso subtiliter ve- 
lutino, demum  glaberrium polito rubro-castaneo zonato 
minutissime striato ; stipite centrali radicante ruguloso sub- 
gracili crustaceo-corticato subtiliter velutino fusco intus molli 
fibroso ; poris mediis longis angulatis dentatis intus pal- 
lidis. 
Natividade, Goyaz. Nov.-Jan. On calcareous soil. 
Piles 2-1 inch broad, thin coriaceous orbicular, umbilicate, 
with the margin depressed and extremely thin, or acute and 
repand; at first very minutely velvety, at length quite smooth 
and shining, of a red chestnut brown, concentrically zoned, 
and extremely minutely striate with innate fibres : substance 
tawny. 
.. Stem central, 2 inches long, about 1 line thick, rooting at 
the base, but obtuse, tawny within, stuffed with spongy- 
