2962 LICHENACEI. [PARMELIA. 
n.1513. Parmelia terebrata (Hoffm.), Mudd, Man. p.97. Parmelia 
diatrypa Hook. Fl. Scot. ii. p. 56; Sm. Eng. Fl. v. p. 204; Tayl. 
in Mack. Fl. Hib. ii. p. 150. Physcia diatrypa Gray, Nat. Arr. 
i. p. 486. Lichen diatrypus Sm. Eng. Bot. t. 1248.—Brit. Ews.: 
Leight. n. 264; Larb. Cesar. n. 66; Cromb. n. 145. 
In general appearance like small states of P. physodes, from which, 
apart from the chemical reaction of the medulla and the nuwber of the 
spores, the peculiar perforations in the laciniz at once distinguish it. 
The thallus is usually sprinkled with round whitish soredia (form 
soredrobola Nyl.). In this country it has not occwred fertile. The sper- 
mogones, which are very seldom present in our specimens, are as in 
P. physodes, 
Hab. On rocks among mosses and on the trunks of trees in maritime 
and upland districts.—Distr. Local in the Channel Islands, S.W. Eng- 
land, N. Wales, S. Scotland and the W. Highlands, in S.W. and N. 
ITreland.—B. M.: Bonne Nuit, Island of Jersey. New Forest, Hants; 
Bolt Head and Valley of Rocks, Lynton, Devonshire ; near Penzance and 
Tregawn, Cornwall; Barmouth and Dolgelly, Merionethshire; foot of 
Snowdon, Carnarvonshire. New Galloway, Kirkcudbrightshire; Bal- 
lachulish, Argyleshire. Pass of Keim-an-High, co. Cork ; Glenmore Lake 
and Dunkerron, co. Kerry; Connemara, co. Galway; Cushendun, co. 
Antrim. 
43, PARMELIOPSIS Nyl. 
Lich. Scand. (1861) p. 105 (ut 
sectio Parmelis) ; Not. Sillsk. 
pro F. et Fl. Fenn. Forh. 
n. ser. v. (1866) p. 121.— 
Thallus small, thin, appressed, 
stellate; beneath sparingly 
fibrilloso-rhizinose. Apothe- 
cia small, parmelioid ; para- 
physes not discrete; spores 
8ne, simple, more or less 
ellipsoid, colourless; hyme- 
nial gelatine bluish with 
iodine. Spermogones scat- 
tered, at length slightly pro- 
minent; sterigmata short, 
simple ; spermatia long, aci- 
cular, arcuate. 
A small genus separated from 
Parmelia on account of its @ was.ss, 
spermatia, which are like those Hig. 45. 
of Squamaria in the Lecanorei, Parmeliopsis ambigua Nyl.—a. Vertical 
but the thalius shows that it section of a young portion of thallus, 
belongs to this tribe. Two of Witharhizina beneath, x200. 0. Ver- 
its three European species occur tical section of an aputhecium, x30. c. 
sparingly in Great Britain. A theca, x350. d. Spores, x500. ¢. 
a Vertical section of thallus with a spermo- 
gone (on the left beneath, a rhizina), 
x 30. f Sterigmata and spermatia, x 500, 
