PHYSC1A, | PHYSCIEL. 307 
Univ. (1810) p. 474. Lichenoides glaucum orbiculare, segmentis 
latiusculis, scutellis nigris Dill. Muse. 177, t. 24. f. 713. 
The milk-white pruina with which the thallus and apothecia are 
covered is often but little dense. It has somewhat the appearance of 
subsp. pityrea, from which it at once differs in the absence of soredia. 
The apothecia are rare in the British specimens, 
Hab. On trunks of trees in maritime and mountainous districts.— 
Distr. Very local and scarce in S. England, the Central Grampians, 
Scotland, and §.W. Ireland.—B. M,: Isle of Wight. Craig Tulloch, 
Blair Athole, Perthshire. Adare, co. Limerick. 
Var. 6. subvenusta Nyl. Bull. Soc. Linn. Normand. sér. 2, t. vi. 
(1872) p. 285.—Thallus more or less pruinose. Apothecia mode- 
rate or somewhat large, pruinose, the receptacle crowned at the 
base.—Physcia pulverulenta f. laciniolata Cromb. Journ. Bot. 1872, 
p. 358. P. pulverulenta var. venusta Leight. Lich. Fl. p. 147 pro 
parte, ed. 3, p. 186 pro parte. Lichen pulverulentus Eng. Bot. 
t. 2063. Lichen stellaris 3. Lightf. Fl. Scot. ii. p. 824; y. Huds. Fl. 
Angl. ed. 2, p. 584; var. 3, With. Arr. ed. 3, iv. p. 81, Lichenoides 
scutellis limbo cinereo crispo cinctis Dill. in Ray Syn.-ed. 3, p. 75. 
Distinguished by the lacinioli or lobules which crown the base of the 
receptacle, in which respect it is subsimilar to subsp. venusta. Occa- 
sionally the thallus also is more or less covered with minute suberect 
lobules, The apothecia are generally numerous, and, in entire specimens, 
some have the receptacle nearly or quite naked. 
Hab. On the trunks of old trees in maritime and upland districts.— 
Distr. Somewhat local and scarce‘in England; rare in 8. Scotland and 
among the 8S. Grampians—B. M.: Norwich, Norfolk; Henfield and 
Glynde, Sussex ; Respring and near Penzance, Cornwall ; Kemble, Wilt- 
shire; Windsor Great Park, Berkshire; near Cambridge; Oswestry, 
Shropshire; Levens, Westmoreland. Ravelrig, near Edinburgh; Fin- 
larig, Killin, Perthshire. 
Var. y. angustata Nyl. Act. Soc, Linn. Bord. sér. 3, i. (1856) 
p. 308.—Thallus somewhat small, pale greyish-red or subcervine, 
epruinose ; lacinie narrow, discrete, beneath densely blackish-hispid 
with rhizinie. Apothecia rather small, naked or pruinose, brown 
or brownish-black.—-Cromb. Lich. Brit. p. 38; Leight. Lich. Fl. 
p. 147, ed. 3, p. 185.—Borrera pulverulenta 6. angustata Mudd, 
Man. p. 110. Lichen angustatus Hoffm. Enum, (1784) p. 77, t. 11. 
£2; 
The narrow discrete laciniz and the numerous rhizine render this a 
well-marked variety. In its typical condition, as noticed by Acharius, 
Lich. Univ. p. 474, the lacinize are continuous from the centre to the cir- 
cumference; but intermediate states occur in which the laciniz are shorter 
and not so continuous, as is usually the case in Britain. The apothecia 
in our specimens are not very numerous. 
Hab. On the trunks of old trees in upland districts.—Distr. Local and. 
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