256 L1CI1ENACEI. [PARMELTA. 



with few rhizinoo ; laciniac narrow, convex, rugoso-plicate, imbricate 

 and complicate, incurved at the apices (K f +3' ellovvi8h 5 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 ; Lcight. 

 Lich. Fl. ed. 3, p. 118. Parmelia discreta Nyl., Cromb. Lich. Brit, 

 p. 36. Parmelia pliysodes var. discreta Leight. Lich. Fl. p. 127. 

 Parmelia sti/rjia var. miiior Nyl. ex Carroll, Journ. Bot. 1865, p. 288 ; 

 Cromb. Lich. Brit. p. 35. Parmelia encausta var. dtygioides Linds. 

 Trans. Hoy. Soc. Edin. xxii. p. 224 ; Mudd, Man. p. 99. Lichen, 

 eiwaustus Eng. Bot. t. 2049. As pointed out in Grevillea, vii. p. 98, 

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

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



Looks intermediate between P. styyia and P. encausta, being sometimes 

 confounded with the latter. The presence of rhiztnae very rarely on 

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

 Subsection. The thallus varies in colour from nearly pitch-black to dark- 

 grey, the laciniae bein}r 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. 



JIfib. On granitic and quartzose boulders in alpine places. Di^tr. Local 

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

 B. M. : Ben More and Cairn Go war, Perthshire ; Clova Mts.. Forfarshire ; 

 Cairn Drochit, Morrone and Beu-nabooid, Braemar, Aberdeenshire ; Ben 

 Nevis, Inverness-shire. Co. Mayo. 



28. P. lanata Wallr. Fl. Germ. iii. (1831) p. 529. Thallus ex- 

 panded, decumbent, loosely appresscd, setaceo-filiform, dichotomously 

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

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

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

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

 coucolorous, the margin subentire or granulato-un equal ; 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 Gray, 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 ca-spitosa 

 emits, capillacea atra Dill. Muse. 66, t. 13. f. 9. As already observed 

 the Lichen lanatus of our older writers is Alectoria Licolor. 



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

 to Alectoria. The presence, however, of rhizinae on the under surface 

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

 the distinctly Parmelioid character of var. ft 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 render the thalline fil.-inicnt.s 

 torulose or noduloso-uuequal. They are immersed, with sterigm.ita 



