25(3 LICUENACEI. [PARMELTA.. 



with few rhizinoQ ; laciiiiai narrow, convex, rugoso-plicate, imbricate 



and complicate, incurved at the apices (X f_-^'' '°^^'® ^, CaCl~). 



Apothecia small, concave, or at length slightly convex, blackish, the 

 margin entire ; spores subglobose or ellipsoid, 0,007-12 mm. long, 

 0,005-9 mm. thick. — Cromb. Journ. Bot. 1872, p. 357 ; Leight. 

 Lich. Fl. ed. 3, p. 118. — Farmella discreta Nyl., Cromb. liich. I3rit. 

 p. 36. Parmelia phyfodes var. discreta Leight. Lich. PI. p. 127. 

 Parmelia sti/r/ia var. minor Xyl. ex Carroll, Joum. Bot. 1805, p. 288 ; 

 Cromb. Lich. Brit. p. 35. Parmelia encausta var. sti/r/ioides Linds. 

 Trans. Roy. Soc. Edin. xxii. p. 224 ; Mudd, Man. p. 9SJ. Lichen 

 encanstus Eng. Bot. t. 2049. — As pointed out in Grevilloa, vii. p. 98, 

 this ought rather to be called P. atrofusca (Schoer.). — Brit. Exs. : 

 Cromb. n. 32 ; Dicks. Hort. Sic. n. 25 pro parte. 



Looks intermediate between P. stygin and P. encausta, being soiuetimps 

 confounded with the latter. The presence of rhizin;TB very rarely on 

 the under surface iu very young plants shows that it belongs to this 

 Siibsecti(m. The thallus varies in colour from nearly pitch-black to dark- 

 grev, the laciniae beiu^- often torulose. It is generally fertile, the apo- 

 thecia being scattered and at length somewhat large. The spermogones 

 are black, minute, with spermatia 0,007 mm. long, about 0,001 mm. 

 thick. 



Hah. On granitic and quartzose boulders in alpine places. — DlMr. Local 

 and scarce on the Grampians, Scotland ; very rare in X.W. Ireland. — 

 B. M. : Ben More and (Jairn Gowar, Perthshire ; Clova Mts., Forfarshire ; 

 Cairn Brochit, Movrone and Beu-nabooid, Braemar, Aberdeenshire ; Ben 

 Nevis, Inverness-shire. Co. Mayo. 



28. P. lanata Wallr. Fl. Germ. iii. (1S31) p. 529.— Thallus ex- 

 panded, decumbent, loosely appressed, setacco-filiform, dichotomously 

 and intricately branched, olive-brown or brownish-black, somewhat 

 shining ; beneath paler, with minute rhizinas ; branches unequal, 



rounded, slender, flexuose, furcate at the apices (K~, CaCl~). 



Apothecia lateral or subterminal, nearly moderate, plane or convex, 

 concolorous, the margin subentire or granulato-unequal ; spores 

 0,007-11 mm. long, 0,006-8 mm. thick. — Mudd, Man. p. 101 ; 

 Cromb. Lich. Brit. p. 35 ; Leight. Lich. Fl. p. 124. — Alectoria lanata 

 Leight. Lich. Fl. ed. -3, p. 80, Cornicularia lanata Grav, Nat. Arr. 

 i. p. 405 ; Hook. Fl. Scot. ii. p. 69 : Sm. Eng. Fl. V. p. 233 ; 

 Tayl. in Mack. Fl. Hib. ii. p. 87. Lichen lanatus, Linn. Sp. PI. 

 (1753) p. 1153 ; Eng. Bot. t. 846 (middle fig.). Usnea caspitosa 

 exilisi, caiiiUacea atra Dill. Muse. ^!>G, t. 13. f. 9. — -As already observed 

 the Lichen lanatus of our older writers is Alectoria hicolor. 



A species entirely Alectorioid in habit, so that it might be referred 

 to Alectoria. The presence, however, of rhizinae on the under sui-f;ice 

 of the thallus, the crenulato-undulate margin of the apothecia, and 

 the distinctly Parmelioid character of var. /3 show that it belongs to 

 this genus. The thallus is often suberect, and in favourable situations 

 spreads extensively. The apothecia are rare, but the spermogones are 

 frequent and sometimes so abundant as to ri-nder the thaliine lilaments 

 torulose or uoduloso-unequal. Tliey are immersed, with sterigmata 



