PHYSCIA | PHYSIACEX 237 
with the pruina. Apothecia rare, the margin crenate.—Leight. 
Lich. Fl. ed. 2, p. 479; ed. 3, p. 136 (form); subsp. muscigena 
Cromb. in Grevillea xv. p. 78 (1887) & Monogr, i. p. 309. 
Parmelia muscigena Ach. Lich. Univ. p. 472 (1810). 
A very rare variety in this country, only one imperfect specimen 
having been gathered. The habitat rather suggests that the form of 
the laciniz may be due to the more moist conditions. The spores 
are on the whole smaller than in the species, measuring 24-80 yp long, 
11-15 p thick. 
Hab. On decayed mosses on the ground.—B. M. Craig Tulloch, 
Blair Athole, Perthshire. 
Var. venusta Oliv. Exp. Syst. Lich. p. 179 (1897).—Thallus 
of somewhat narrow incised lobes, brown- or brownish-grey, 
slightly or not pruinose. Apothecia with proliferous margins.— 
Cromb. Lich. Brit. p. 39; f£. venusta Leight. Lich. Fl. p. 147 
(1871) (excl. Syn. Engl. Bot.); ed. 3, p. 136; subsp. venusta 
Nyl. ex Lamy in Bull. Soc. Bot. xxv. p. 383 (1878); Cromb. 
in Grevillea xv. p. 78 & Monogr. i. p. 308. Parmelia venusta 
Ach. Meth. Lich. p. 211, t. 8, fig. 5 (1803). 
Differs chiefly in the less pruinose or naked thallus and in the 
coronate apothecia. The latter character is sometimes absent, and 
very occasionally is present in the species. 
Hab. On trunks of old trees in wooded situations.— Distr. Rare 
in the northern districts of England and S.W. Scotland and Ireland. 
—B. M. Near Ayton, Cleveland, Yorkshire; New Galloway, Kirkcud- 
brightshive; Kenmore, Perthshire; near Fort William, Inverness- 
shire; Carrigaloe, Cork; Ballynegarde, Limerick. 
Form subvenusta Oliv. 1. c.—Similar to var. venusta but with 
the thallus more distinctly pruinose.—Physcia pulverulenta vav. 
laciniolata Cromb. in Journ. Bot. x. p. 358 (1872). Lichenoides 
arboreum ... . scutellis limbo cinereo crispo cinctis Dill. in Ray Syn. 
ed. 3, p. 75, n. 75 (1724). Lichen stellaris var. Lightf. FI. 
Scot. ii. p. 824; Huds. Fl. Angl. ed. 2, p. 534; With. Arr. 
ed. 3, iv. p. 31. L. pulverulentus Sm. Engl. Bot. t. 2063 (1809) 
(non Schreb.). 
Eaxsice. Johns. n. 250. 
Similar to var. venusta but generally pruinose; as in the variety, 
some of the apothecia have occasionally entire margins. 
Hah, On the trunks of old trees in maritime and upland districts. 
—Distr. Local and rare in England, Scotland and Iveland.—B. M. 
Respring and Penzance, Cornwall; Henfield and Glynde, Sussex; 
Kemble, Wilts; Windsor Great Park, Berks; Milton, Oxfordshire ; 
Oswestry, Shropshire; near Cambridge; Levens, Westmoreland ; 
New Galloway, Kirkcudbrightshire ; Ravelrig, near Edinburgh; Fin- 
larig, Killin, Perthshire. 
7. Ph. grisea A. Zahibr. in Ann. K. K. Naturhist. Hofmus. 
Wien xxvi. p. 177 (1912).—Thallus spreading, appressed and 
