PARMELIA. | PARMELIET. 253 
convex, crenato-incised and but slightly dilated at the apices (KT 
CaCl_). Apothecia small or moderate, scattered, subconcolorous, 
the margin entire or subentire; spores 0,009-12 mm. long, 0,005— 
6 mm. thick.—Cromb. Grevillea, x. p. 25.—Parmelia olivacea vars. 
proliva et dendritica (Pers.) Leight. Lich. Fl. p. 112, ed. 3, p. 115. 
Parmelia olivacea y. proliva Ach, Meth. (1803) p. 214.—Brit. Evs. : 
Leight. n. 365. 
Generally regarded as a variety of P. oltvacea, but separated by the 
form of the laciniz and by the smaller spores. The thallus is usually 
smooth, but sometimes rugulose, as is also the margin of the apothecia. 
The apothecia are rare in Britain, but the spermogones are not unfrequent. 
They are at length somewhat prominent, with spermatia scarcely 0,007 
mm. long, and about 0,001 mm. thick. 
Hab. On rocks in maritime and upland districts.— Distr. Local and 
scarce in W. England and Wales; here and there in Scotland and in 
N.W. Iveland.—B. M.: Malvern Hills, Worcestershire; Caer Caradoc, 
Shropshire ; Llandegley Rocks, Radnorshire ; Moel-y-Golfa, Montgomery- 
shire; Douglas Head, Isle of Man. New Galloway, WKirkeudbrieht- 
shire; Island of Lismore, Argyleshire ; Portlethen, Kincardineshire; Craig 
Guie, Braemar, Aberdeenshire. Connemara, co. Galway. 
Subsp. 1. P. sorediata Cromb. Journ. Bot. 1882, p. 273.—Thallus 
smaller, adnate, sprinkled towards the centre with whitish or 
brownish-white, verrucoso-prominent soredia; laciniz somewhat 
plane (K_, CaCl7). Apothecia small; spores 0,010-12 mm. long, 
0,005-6 mm. thick.—Parmela stygia b. sorediata Ach. Lich. Univ. 
(1810) p. 471. 
Distinguished by the pulvinate soredia with which the thallus is more 
or less sprinkled towards the centre or occasionally almost throughout. 
It is of small size (scarcely more than 1 in.), frequently opaque, with the 
lacinize contiguous. The apothecia, which are small and scattered, are 
very rare in Britain as in other countries. 
Hab, On rocks in upland mountainous districts— Distr. Very local and 
rare in W. England and among the Central and N. Grampians, Scotland. 
—B. M.: North Hill, Malvern, Worcestershire. Craig Tulloch, Blair 
Athole, Perthshire; Craig Guie, Braemar, Aberdeenshire. 
Subsp. 2. P. Delisei Nyl. Flora, 1873, p. 67.—Thallus larger, pale- 
olive, the lacinie broader at the circumference (K(CaCl) 7 ¢ reddish)" 
Apothecia and spores as in P. prolixa.—Cromb. Journ. Bot. 1873, 
p. 138; Grevillea, x. p. 25.—Parmelia Delisei Leight. Lich. Fl. ed. 3, 
p. 129. Parmelia olivacea var. Delisei Dub. Bot. Gall. (1829) 
p. 602. Parmelia olivacea var. aquiloides Linds., Mudd, Man. p. 99. 
—Lichen olivaceus pro parte and Parmelia olivacea pro parte of the 
older and some more recent British authors.—Brit. Exs.: Leight. 
n. 291 pro parte; Larb. Lich. Hb. n. 328; Bohl. n. 109 pro parte. 
The characters of the thallus and the chemical reaction make this a 
distinct subspecies. In old plants the apothecia become large, crowded, 
and somewhat flexuose. 
