350 LICHENACEI. [lECANORA. 



— Psoroma liypnorum Hoffm. Deutsch. Fl. ii. (1795) p. 166 ; Cromb. 

 Lich. Brit. p. 44 ; Leight. Lich. Fl. p. 163, ed. 3, p. 149 ; Gray, Xat. 

 Arr. i. p. 445. Pannaria hypnorum Mudd, Man. p. 124. Squa- 

 maria hypnorum Sm. Eng. Fl. v. p. 194. Lichen hypnorum Dicks. 

 Crj-pt. fasc. iii. p. 14 ; With. Arr. iv. p. 22 ; Eng. Bot. t. 74U.— 

 Brit. Exs. : Larb. Caesar, n. 70 ; Cromb. n. 58 pro parte. 



Internally somewhat resembling more developed states of Pannaria 

 brunnea, with whicdi it is confounded in some of our older herbaria, but 

 is definitely separated by the texture of the thallus. The plant is more 

 or less effuse, with the squamules either somewhat discrete, or imbri- 

 cately crowded, or sometimes little developed — according to the habitat. 

 The hypothallus is very rarely visible, and only in corticolous speci- 

 mens, where it is thin, greyish or greyish-brown {vide Xyl. Pyr. Or. 

 p. 12o). The apothecia are generally numerous, becoming larger in old 

 plants. 



Hab. Among mosses on the gi-ound, rocks, and walls in maritime and 

 upland districts. — Distr. JRather local in England, N. ^^'ales, and the 

 Channel Islands, more frequent in Scotland ; not recorded from Ireland. 

 — B. M. : Grosnez, Island of Jersey ; Island of Guernsey. Yarmouth, 

 Suffolk; Respiing, Cornwall; Tresco, Scilly Islands ; Hale's End, near 

 Malvern, Worcestershire ; Aberdovey, Merionethshire ; Eglestone, Dur- 

 ham ; The Cheviots, Northumberland. Pentland Hills, near Edinburgh ; 

 Hills above Greenock, Renfrewshire ; Barcaldine, Argyleshire ; Killin, 

 Craig Calliach, Ben Lawers, and Glen Fender, Perthshire ; Clova and near 

 Dundee, Forfarshire ; Craig Climy, Braemar, Aberdeenshire ; Glen Nevis, 

 Inverness-shire. 



Form deaurata Nyl. Xot. Sallsk. pro F. et Fl. F. Forh. v. (1866) 

 p. 125. — Thallus bright-yellow or tawny-yellow. Apothecia rather 

 large, with concolorous thalline margin. — Cromb. Grevillea, xviii. 

 p. 44. — Psoroma hypnorum form deaurata jS'yl. Lich. Scand. p. 121 ; 

 Cromb. Lich. Brit. p. 44. Lecanora lepidora /3. deaurata Ach. Lich. 

 JJmv. (1810)]}. 4:18.— Brit. Exs. : Cromb. n. 58 pro parte. 



Differs merely in the more yellowish thallus and the normally larger 

 apothecia. When the thallus is less developed it is more luxuriant at the 

 margins of the apothecia. 



Ilab. Among mosses on boulders and walls in maritime and upland 

 districts. — Distr. Seen only from N. Wales and the Highlands of Scot- 

 land. — B. M. : Cwm Bychau, Merionethshire. Appin, Argyleshire ; Glen 

 Lochay, Killin, Perthshire ; Corriemulzie, Braemai', Aberdeenshire. 



Subgenus 2. SQUAMAIIIA jS^yl. Not. Sallsk. pro F. ct Fl. F. 

 Forh. V. (1866) p. 125, — Thallus radiately laciniate or cartila- 

 gineo-squamose. Apothecia Iceanorine ; spores 8nre, ellipsoid, 

 simple, colourless ; hymenial gelatine bluish with iodine. Sper- 

 mogoucs with simple sterigmata and long, arcuate, spermatia. — 

 Sfjuamaria'DC. Fl. Fr. ii. (1805) p. 374 ; Nyl. Mem. Soc. Cherh. iii. 

 p. 177. 



