from its learned author in time to avail myself of its contents
in the description of this and the following species.
Fig. 1. a, H.Jbliioolum, nat. size, b, Perithecia removed,
cells, d, Sporules.— All magnified except a.
c, Sporuliferous
H Y S T E R IU M m a c u l a r e .
P a le spot Hysterium.
d. Mycol. V. 2 .
SPECIFIC CHARACTER.
H ysterium maculare ; macuUs exaridai, pallida;, aggregatum, suhrotundo-ellip-
ticum, atrum, margine depresso pallidiore.
H. collected on pale defined spots, roundish-elliptical, black, the margin depressed,
and paler.
H y sterium maculare. Fries, Scl. Suec. No. 167 Ejusd.
p . 5 9 2 .
H ab. On the dead and dry leaves of various trees, in autumn. On Oak-
leaves at Appin, Captain Carmichael. Banks of Loch Lomond.
Perithecia small, aggregated, on pale, almost colourless, distinctly defined
spots sometimes bounded by a black lin e : irregularly placed, oval or
roundish-elliptical, smooth, black, the centre somewhat prominent, and
at length opening by a narrow cleft, the border depressed, scarcely rising
above the level o f the leaf, and o f a less deep black. Sporuliferous tubes
filiform. I could not detect the sporules. The disk, according to F ries,
is pale yellowish.
This handsome Hy ste rium , which I had considered as entirely
new, agrees so admirably with H . maculare of F r ie s ,
as to leave no doubt on my mind of its being the same species!
It is frequently found along with Phacidium dentatum on the
same leaf.
Forty-eight species of this genus are described by F r ie s in
his Systema.
Fig. 2. 1, H. maculare, nat. size. 2, A part o f a group. S, Perith ecia removed.
4>, Sporulferotis tubes,—All magnified except Fig, 1 .
k