. A monograph of lichens found in Britain; being a descriptive catalogue of the species in the herbarium of the British Museum. Lichens. lECANORA.] LECAHO-LECIDEEI. 351 Characterized by the type of the thallua, which is comparable with that of Parmeliopm, and by the structure of the spermogones, which are immersed, their ostioles being concoloroua with the Fig. 59. Lecanora (SqiiaiJiaria) crassa Aoh.âa. A theca and , x350. b. Two spores, X500. c. Sterigmata and spermatia, x500. 2. L. crassa Ach. Lich. Univ. (1810) p. 413.âThallus indeter- minate or suborbicular, subcartila
. A monograph of lichens found in Britain; being a descriptive catalogue of the species in the herbarium of the British Museum. Lichens. lECANORA.] LECAHO-LECIDEEI. 351 Characterized by the type of the thallua, which is comparable with that of Parmeliopm, and by the structure of the spermogones, which are immersed, their ostioles being concoloroua with the Fig. 59. Lecanora (SqiiaiJiaria) crassa Aoh.âa. A theca and , x350. b. Two spores, X500. c. Sterigmata and spermatia, x500. 2. L. crassa Ach. Lich. Univ. (1810) p. 413.âThallus indeter- minate or suborbicular, subcartilaginous, loosely adpressed, thick, Bquamoao-imbricate, pale-Uvid or pale-yaUowish; squamules some- what depressed, roundly lobato-erenate (Kâ). Apothecia mode- rate, sessile, plane or somewhat convex, reddish-brown, the thalline margin entire, at length excluded ; spores ellipsoid or oblongo-eUip- soid, 0,011-14 mm. long, 0,005-6 mm. thick.âCromb. Grevillea, xviii. p. 44 ; Hook. Fl. Scot. ii. p. 51.âSquamaria crassa Sm. Eng Fl. V. p. 193; Mudd, Man. p. 127; Cromb. Lich. Brit. p. 44 Leight. Lich. Fl. p. 171, ed. 3, p. 157. Psoroma crassum Gray, Nat, Arr. i. p. 444. Lichen crassus Huds. Fl. Angl. ed. 2 (1778), p. 530 Eng. Bot. t. 1893. Lichen cartilagineus Lightf. Fl. Scot. ii. p. 815 With. Arr. iv. p. 29. Lichenoides cartilagineum, scutellis fulvis planis DUl. Muse. 179, t. 24. f. 74.âBrit. Exs.: Leight. n. 5 ; Larb. Cjesar. n. 73; Lich. Hb. n. 333; Cromb. n. 157; Bohl. n. 2; Dicks. Hort. Sic. n. 24. The largest British species of the subgenus, with the thallus usually very much expanded, rarely smaller and somewhat orbicular, often here and there whitish. With us it is much less variable than it is in warmer regions, presenting only the following form. It is usually well fertile, the apothecia becoming rather large in age. Sab. On the ground and on rocks, chiefly calcareous, in maritime and upland districts. âDistr. General and common in England and Wales; rarer in Scotla
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectlichens, bookyear1894
