224 LICHENACET. 



towards the circumference ; laciniae somewhat ascending, much en- 

 tangled, subplane or plane, crisp (K~, CaCl~). Apothecia mode- 

 rate, brownish-red, the receptacle smoothish, margin nearly entire ; 

 spores ellipsoid, 0,005-11 mm. long, 0,004-0 mm. thick. Carroll, 

 Journ. Bot. 1866, p. 22 ; Cromb. Lich. Brit. p. 27 ; Leight. Lich. 

 PI. p. 101, ed. 3, p. 96. Lichen Fahlunensis Linn. Sp. PI. (1753) 

 p. 1143; Erig. Bot. t. 653 (fig. only). Vide sub P. Falilunensi. 

 Brit. Exs. : Cromb. n. 25 ; Dicks. Hort. Sic. n. 23. 



Often confounded with the preceding, from which, apart from the 

 characters of the thallus and the receptacle of the apothecia, it is distin- 

 guished by the absence of any chemical reaction and by the form of the 

 spermatia. The apothecia are numerous, chiefly central, sometimes be- 

 coming large in old age. The spermogones usually very numerous, have 

 short, simple sterigmata, and spermatia oblongo- or fusiformi-ellipsoid, 

 0,003-4 mm. long, 0,0015-20 mm. thick. 



Hob. On rocks and boulders chiefly in alpine situations. Distr. Rather 

 local, being confined to N. Wales, S. Scotland, and the Grampians, espe- 

 cially those of Braemar, where it is plentiful. B. M. : Carnedd Llewelyn 

 and "the Glyders, Carnarvonshire. New Galloway, Kirkcudbrightshire ; 

 Ben Lawers and Hills near Amulree, Perthshire ; Katelaw, Forfarshire ; 

 Ben-niboord. Morrone, and Lochnagar, Braemar, Aberdeenshire ; Ben 

 Nevis, Inverness-shire. 



Form tenuisectum Cromb. Grevillea, xv. (1886) p. 49. Laciniaa 

 narrower and more intricately crowded. Cetraria commixta f. tenui- 

 setta Fr. fil. Lich. Scand. (1871) p. 109. 



Connected with the type by intermediate states, and probably not con- 

 stant ; always sterile. 



Hob. On rocks in alpine situations- Distr. Local and scarce on the 

 Grampians, Scotland. B. M. : Ben Lawers, Perthshire ; Morrone, Brae- 

 mar, Aberdeenshire. 



C. Spermatia acicular, cylindrical, slightly incrassate at one apex. 



a. Thallus suberect or appressed, somewhat loosely affixed, 

 concolorous ; lacinias narrow or dilated. 



9. P. juniperinum Nyl. Act. Soc. Linn. Bord. ser. 3, i. (1857) 

 p. 295. Thallus ascending, lobato-laciniate, citrine or greenish- 

 yellow on both sides, or somewhat paler beneath ; medulla intensely 

 citrine; latinise crowded, eroso-crenate, crisp, concave (K~, CaCl~). 

 Apothecia adnate to the front of the laciniee, moderate, badio- 

 reddish or badio-brownish, the margin corrugate or denticulate ; 

 spores ellipsoid, 0,006-9 mm. long, 0,004-6 mm. thick. Nyl. Syn. 

 i. p. 312, t. 8. f. 34 ; Cromb. Lich. Brit. p. 27 ; Leight. Lich. Fl. 

 p. 102, ed. 3, p. 96. Cetraria juniperina Gray, Nat. Arr. i. p. 432 ; 

 Sm. Eng. Fl. v. p. 220 : Mudd, Man. p. 79. Lichen juniperinus 

 Linn. Sp. PI. (1753) p. 1147. Lichen juniperinus Huds. Fl. Angl. 

 p. 452 ; Lightf. Fl. Scot. ii. p. 836, apparently refers to some state 

 of Phystia parietina, as observed in Eng. Bot. 1 94, and With. Arr. 

 ed. 3,'iv. p. 34 (cfr. Cromb. Journ. Bot. 1872, p. 234). 



