PHACIDIUM. . 887 
Order VIIT.—PHACIDIACEZ. 
Receptacle immersed, more or less coriaceous ; hyme- 
nium at first covered, at length exposed by the "regular 
or irregular fissure of the outer covering. (Plate XII. 
figs. 76-78.) 
Name—From the typical genus Phacidium. 
ARRANGEMENT OF THE GENERA. 
I. Phacidium. Fries. III. Stegia. Fries. 
II. Trochila, Fries. 
Key to THE GENERA, 
Hymenium becoming exposed by the epidermis of 
the matrix splitting from the centre into lacinisa Phacidium. 
Hymenium becoming exposed by splitting at the 
summit irregularly .. . Trochila. 
Hymenium becoming exposed by the falling off of 
a horizontal operculum ts oe . .. Stegia. 
Genus I—PuwHacipium. Fries. 
Perithecium orbicular, flattened, subdimidiate, de- 
hiscing from the centre into lacinix, distinct from the 
placentiform disc. (Plate XII. fig. 76.) 
The perithecium is covered by the epidermis of the 
matrix; the hymenium is mostly dark-coloured, lining 
the base of the perithecium. - 
On leaves and bark. 
Name—gaxée, a lentil, edoc, resemblance ; shaped 
like a lentil. 
ARRANGEMENT OF THE SPECIES. 
A. Sporidia elliptic or Guar dais 
(a) Brown A +. - species 1 
(b) Hyaline 5 é o » 2-6 
B, Sporidia fusiform or ‘subfusiform “s » 7-10 
c. Sporidia filiform or subfiliform .. £5 » 11-16 
Key To THe Sprcies. 
On trees and shrubs .. . ne a fs 
On herbaceous plants. . oe o ve oe 
On the stems .. oe ee oe an a 
{On the leaves .. o a os . o. 
9 DO et 
