26 EPIEBACEI. [ PYRENOPSIS. 
are enveloped in a thickish gelatinose tunic.” The apothecia are rare in 
the few British specimens gathered, and the spores are seldom well deve- 
loped. _ We have not detected any mature spermogones on our specimens, 
though these would determine more definitely the place of this species, as 
the spermatia in the Phyliscodet (Nyl. Flora, 1887, p. 183) are elongate 
and arcuate. 
Hab. On moist mica-schist rocks in alpine places.—Dist. Very local 
and rare, having been found only very apene'y among the S. Grampians. 
—B. M.: Summit of Ben Lawers, Perthshire. 
Tribe IIT. HOMOPSIDEI Nyl. ew Stiz. St. Gall. Nat. Ges. 
1876, p. 193; Flora, 1887, p. 133. 
Thallus variable in form and texture, being either (1) fructi- 
culose, with gonimia seriate, and chiefly contiguous or seriately 
connate in the branches and branchlets, or (2) squamuliform or 
granuloso-continuous, uniform, with gonimia (haplogonimia) some- 
what large and subsolitary, or large and solitary, always gelatinoso- 
involute; medullary filaments wanting. Apothecia pyrenocarpous, 
innate in thalline protuberances, externally more or less eminent, 
or immersed and without any external protuberance ; spores simple 
or rarely l-septate; paraphyses slender or none. Spermogones 
inclosed in thalline protuberances, or immersed and without any 
protuberance ; spermatia either shortly cylindrical, straight (the 
sterigmata simple), or elongate, thin, arcuate (the sterigmata 
simple, somewhat short). 
This tribe comprises various small brown or blackish plants, agreeing 
in the common character of having pyrenocarpous apothecia, though in 
other respects differing considerably in the several genera. According 
to the form and texture of the thallus, the arrangement of the gonimia, 
and the presence or absence of thalline protuberances enclosing the 
fructification, it is divided into two subtribes, viz. Ephebet and Phyllis- 
codet. To the latter, according to Nylander zn Uitt., belongs Collema 
granuliforme Nyl.=Phylliscodium granuliforme Nyl., which, although 
recorded (erroneously) by Leighton (Lich. Fl. ed. 3, p. 22) from Galway, 
has not been gathered in our Islands. 
Subtribe HPHEBET Ny). ew Stiz. St. Gall. Nat. Ges. 1876, 
p- 193; Flora, 1887, p. 133. 
Thallas small, byssvid, fructiculoso-ramose ; gonimia tunicated, 
in nodulose syngonimia. Apothecia minute, pyrenocarpous, in 
ellipsoid or pyriform incrassations of the thallus, paraphyses distinct 
or none; spores 8nex, ellipsoid, simple or 1-3-septate, colourless. 
Spermogones innate in globular or shortly ellipsoid thalline tubercles, 
with slender, simplish sterigmata. 
The thallus in its younger and immature state is entirely Sirosiphoid 
in structure; so that this subtribe might briefly be defined as consisting 
of “pyrenocarpous sirosiphoid Ephebacei.” Its two genera are well 
distinguished from each other by the anatomical characters of the 
apothecia. 
