424 LicHK.vACEi. [lecanoka. 



hvmenial gelatine bluish, then tawny-wine-coloured or violet with 

 iodine, — Carroll, Journ. Bot. 1867, p. 255 ; Cromb. Grevillea, xviii. 

 p. 68; Lich. Brit. p. 51, pro parte; Leight. Lich. Fl. p. 207, ed. 8, 

 p. 191. — Luhen umbrinus Ehrh, Crypt. (1793) n. 245. 



Easily recognized in this subsection by the colour of the apothecia. 

 The thallus, which is usually indeterminate, varies somewhat in thickness 

 according to the habitat. Rarely it is more or less scattered over the 

 substratum and little developed ("olive-brownish hypothalliue), when it 

 is forma subdistans Xyl. ex Cromb. .Journ. Bot. 1870, p. 97. The apo- 

 tliecia are at times subbiatorine. The spermogones have the spermatia 

 semicircular, 0,015-22 mm. long, 0,0005 mm. thick. 



Ilab. On rocks, occasionally on old pales, rarely on the ground in 

 maritime and upland districts. — Distr. Only here and there in Great 

 Britain, Ireland, and the Channel Islands. — B. M. : La Moye, Island of 

 Jersev. Lamoma CliflT, Penzance, Cornwall ; Lydd, Kent ; Aberdovey, 

 Merionethshire: Ayton. Cleveland, York-hire. Barcaldine, Argyleshire; 

 Blair Atholt^, Perthshire ; Portlethen and Bay of Nigg, Kincardineshire. 

 Cliffs of 31oher, co. Clare ; Killery Bay, Connemara, co. Galway. 



104. L. creunlata Xyl. Xot. Siillsk. pro F. et Fl. Fenn. Fdrh. 

 n. s. V. (l&66)p. ISl ; Flora, l872,p. 250. — Thallus effuse, very thin, 

 often scarcely visible, greyish-white (K— ,CaCl— ). Apothecia 

 small, scattered, brownish-grey, at times caesio-suffused ; the thai- 

 line margin whitish, deeply crenulate ; paraphyses thickish, jointed, 

 brownish at the apices; spores 0,010-16 mm. long, 0,(i05-7 mm. 

 thick : hymenial gelatine bluish, then wine-coloured with iodine. — 

 Sm. Eng. Fl. v. p. 190 pro parte. — L. umhrina subsp. crenulafa 

 Cromb. Grevillea, sii. p. 59, form creunlata Cromb. Lich. Brit. p. 51, 

 Leight. Lich. Fl. p. 207, ed. 3, p. 191. L. albella c. creivdata 

 Mudd, Man. p. 148. Lichen crenuJatus Dicks. Crypt, fasc. iii. 

 (1793) p. 14, t. 9. f. 1; Eng. Bot. t. 93o ; With. Arr. ed. 3, iv. 

 p. 17. According to a specimen from his own Herb, this is also 

 L. f/alactina ft. disjKrso-areolata (non Schaer), Mudd, Man. p. 149. 

 — Brit. Exs. : Larb. Lich. Hb. n. 258. 



Frequently confounded with subsp. dispersa of L. r/alactintt, but distinct 

 in the chnracter of the paraphyses and in the smaller spores, as pointed 

 out by ^ylander, who first definitely discriminated between them. From 

 the preceding species it is distinguished by the tessellato-crenate margin 

 of the apothecia. — the crenulatitns being deeply divided and separated 

 bv a furrow, though in abraded specimens this character is scarcely 

 apparent. It differs also from it in the size of the spermatia, which {fide 

 Nyl. in litt.) are 0,011-15 mm. long, 0,0G0o mm. thick. 



Hah. On calcareous, rarely sandstone, rocks in maritime and upland 

 situatir.ns. — Distr. Seen only from a few localities in S.AV. and X. England, 

 the Grampians, Scotland, and X.W. Ireland. — B. M. : Watcombe Bay, 

 S. Devon; Alfrick, Worcestershire; near Ayton and Carlton Bank, 

 Cleveland, Yorkshire; Fglestone, Durham; Lamplugh, Cumberland; 

 Teesdale, Durham. Craig Tulloch, Blair Athole, Perthshire ; Craig 

 Guie, Bracmar, Aberdeenshire. Oiighterarde, co. Galway. 



