230 LICHF.XACEI. [eVERNIA. 



Form retusa Ach. Lich. Univ. (1810) p. 413. — Thallus caespitoso- 

 erect, shortly laciniate ; laeiuise crowded and retuso-emarginatc at 

 the apices. Apothecia not seen. — Cromh. Linn. See. Journ. I3ot. 

 xvii. p. 569. — Parmelia prunastri (3. retusa Ach. Meth. (1803) 

 p. 257. Lichenoides cornutum broncJuale moJIe, suhtiis incanuin 

 DiU. Muse. IGO, t. 21. f. 55. 



Grows in dense tufts i to 1 in. iu height, and often spreads extensively. 

 It occurs only sterile, and is more or less sorediiferous. 



Ilab. On old pales, chiefly larch, in upland and sometimes in lowlaud 

 districts. — Distr. Seen from only a few localities in S. England, E. and 

 N. Scotand. — B. M. : Near Millhill, Middlesex. Park, near Aberdeen ; 

 Lairg, Sutherlandshire. 



Var. /3. stictocera Hook, in Sm. Eng. Fl. v. (1533) p. 224. — 

 Thallus decumbent, subpendulous or prostrate, subcompressed, 

 greenish sulphur-coloured, concolorous on both surfaces ; lacinige 

 somewhat narrow, attenuate at the apices, often with minute brown 

 or blackish tubercles. Apothecia verj' rare. — Cromb. Urevillea, xv. 

 p. 74 ; Mndd, Man. p. 62; Cromb. Lich. Br. p. 25 ; Leight. Lich. Fl. 

 p. 91, ed. 3, p. 8^. — LicJten stictoceros Sm. Eng. Bot. (1802) 1. 1353. 

 Evernvi prunastri var. gracilis Cromb. Journ. Bot. 1872, p. 233 ; 

 Leight. Lich. Fl. cd. 3, p. 83. Liclien prunastri ft Huds. Fl. Angl. 

 ed. 2, p. 541 ; With. Arr. ed. 3, iv. p. 53 pro parte. Lichenoides 

 cornicvlatum candidum iiioUe, segmentis angustis Dill. Muse. 15il, 

 t. 2l.f. 54. 



Distinguished by the narrower (in corticole plants rather broader), 

 more cylindrical lacinise, and especially by being concolorous on both 

 surfaces. It approaches E. diiuricatn, which does not occur iu our 

 Islands. The lacinise occasionally put forth transverse lacinioli, are but 

 sparingly sorediate, and sprinkled, chiefly at the apices, with peculiar 

 foreign (algoid!-') tubercles (not true cephalodia). The apothecia ai'e 

 extremely rare, and are seen only on corticole specimens. 



Hab. On baie sandy soil, and on heather in sandy soil in maritime 

 tracts, rarely on the trunks of aged tirs in mountainous districts. — Distr. 

 Local and f-carce in the Channel Islands, S. England, and on the Gram- 

 pians, Scotland. — B. M. : Queuvais, Island of Jersey. Lydd Beach, 

 Kent ; Exmouth Downs, S. Devon. Stronaclachan and Finlarig Woods', 

 Ivillin, Ben Lawers, Perthshire ; Deerhill Wood, Forfarshire. 



2. E. furfuracea Fr. Lich. Eur. { 1>31) p. 26. — Tli alius ascending, 

 pendulous, or prostr-.tc, laciniose, fTirfuraceous, greyish or greyish- 

 green ; beneath snbcanaliculate, black or csBsio-black, with a few 

 rhizime at the base ; laciuiae much and dichotomously branched, 

 linear i-attenuate, incurved at the margins (XJ^^^ ^^^' , CaCl~), 



Apothecia subpedicellate, moderate or large, concave, badio-reddish, 

 the margin thin, intlexed ; spores 0,007-10 mm. long, 0,004-5 mm. 

 thick. — Mudd. Man. p. 71 ; Cromb. Lich. Brit. p. 24 ; Leight. Lich. 

 Fl. p. 90, ed. 3, p. 82. — Borrera furfuracea Gray, Nat. Arr. i. p. 435 ; 

 Hook. Fl. Scot. ii. p. 54 : Sm. Eng. Fl. v. p. 223. Parnwlia fur- 

 furacea, Tayl. in Ma >]<. Fl. Hib. ii. p. 144. Lichen furfuraccus Linn. 



