DECADES OF FUNGI. 17 
slender. Sporidia oblong, very slightly curved or sigmoid, uniseptate, 
with frequently a nucleus in either cell. 
This has very much the aspect of a Lichen, but there are no gonidia, 
It has somewhat the same habit as P. leucorhodina, Mont., but has 
no close affinity with any described species, as far as I have been able 
to discover. 
Tab. I. fig. 2: a, P. herpotricha, nat. size ; b, mycelium ; c, asci and 
sporidia, both highly magnified. ; 
* Phacidium dentatum, Kze. 
Has. Caripi. 
The asci, both in the Brazilian and European specimen, contain a 
quantity of thread-shaped sporidia, as in some other species of the 
genus. In the Brazilian individuals they are rather more slender. 
Corda’s figure appears to be taken from something different, as indeed 
the general appearance of the plant seems to indicate. Phacidium 
Delta, Kze., which grows on the leaves of laurels in Madeira, has the 
same structure, but the sporidia are much thicker. 
* Hypoxylon obovatum, Mont. Spheria obovata, Berk. in Ann, of 
Nat. Hist. vol. iii. p. 397. 
Has. On bark.  Caripi. 
* H. Leprieurii, Mont., Ann. des Sc. 2 Ser. vol. i. p. 352. 
Has. On bark. Caripi. 
This might at first be taken for a distinct species, but a section 
shows that it is merely a state of that described by Dr. Montagne. 
The outer surface is covered partiall with a delicate velvety coat. 
Some of the bark is carried up by the disc, forming, together with a _ 
portion of the stroma, an acute margin. Ultimately, however, the 
bark with the stroma attached to it falls off, leaving a hollow disc and 
an obtuse margin, both of which are very evident in a vertical section. 
* Thamnomyces Chamissonis, Ehrenb. Hor. Phys. Ber. p. 79. tab. 17. 
fig. 1. 
The capitula of this fungus contain several oblong perithecia, easly 
as in Hypozxylon Leprieurii, &e., to which it is evidently closely allied. 
The sporidia are oblong, with one side rather curved. I do not find - 
the stem usually hollow. It consists of three parts—the outer laccate — 
coat, a dense black stratum, like charcoal, which is brownish externally, 
and a loose pith, which occasionally vanishes, or is turned aside in the T 
VOL. III. D 5. 
