516 



Lie HEX AC EI. 



[UECEOLAEIA. 



spores 4-8nae, oblon» or ellipsoid, septate and murali-divided, at 

 first colourless, then dark ; paraphyses slender ; hymenial gelatine 

 scarcely tinged or tawny with iodine. Spermogones with some- 

 what branched sterigmata and cylindrical spermatia. 



A small but well-marked genus, whose systematic place has been 

 vai-iously viewed by authors. Evidently, however, it is in this subtriba 

 as now definitely fixed by Nylander. From Thelotrema, to which it is 

 subsimilar in the structure of the apothecia, it differs chiefly in the 

 green gonidia of the thallus and in the form of the sterigmata. 



x-5oq 



X-350 



X-250 



Fig. 74. 

 Urceolaria scruposa Ach.— A. A theca with spores and a paraphysis, X 2.30. 

 B. Two spores, x 350. C. Sterigmata and spermatia of subsp. U. bryophila, 

 X500. I a !> ' 



1. IT. scruposa Ach. Math. (1803) p. 147; Lich.Univ. p. 33S. — 

 Thallus determinate, tartareo-farinose, verrucoso-rugose, continuous 

 or areolato -diffract, greyish or greyish-white (K —•> CaCl ^ red, 

 I '^ blue^" -Apothecia moderate, black or blackish, usually caesio- 

 pruiuose, the proper margin connivent, greyish-black, the thalline 

 margin thick, rugose or slightly crenulate on the inner side ; 

 spores 5-septale, muriform, ellipsoideo-oblong, 0,026-3S mm. long, 

 0,012-15 mm. thick ; paraphyses brown at the apices. — Mudd, 

 Man. p. 165; Leight. Lieh. Fl. p. 234, ed. 3, p. 239 ; Tayl. in 

 Mack. Fl. Hib. ii. p. 132 ; 8m. Eng. Fl. v. p. 172 ; Gray, ]S^at, Arr. 

 i. p. 459. — Lecanora scnqjosa Cromb. Lich. Brit. p. 58. Lichen 

 scruposus Linn. Mant. ii. (1771) p. 131 ; Eng. Bot. t, 266 ; AVith. 

 Arr. ed. 3, iv. p. 19; Dicks. Crypt, fasc. i. p. 11. Lichenoides 

 crustaceum et leprosum, scutelUs nif/ricantibus niajoribus et minorihus 

 Dill. Muse. 133, t. 18. f. 15 '^.—Brit. Exs. : Leight. nos. 54, 

 379 ; Mudd, n. 137 ; Cromb. n. 75 ; Larb. Lich. Hb. n. 136. 



An easily recognized species which can scarcely be confounded with 

 any other lichen. In some habitats it spreads rather extensively, while 

 it varies in the thickness of the thallus. The apothecia are also 

 variable in size, from punctiform becoming moderate or somewhat large, 

 and are either somewhat scattered or at tim^-s crowded. The spermo- 

 gones are not uncommon, with spermatia 0,005-0 mm. long, 0,001 mm. 

 thick. 



