lecidea] lecideace^ 1 1 



§ i. Psora Haller Hist. Stirp. Helv. iii. p. 93 (1768) et auctt., 

 pro parte. (PI. 5.) 



Thallus squamulose ; spores 8nate. Spermogones with simple 

 sterigmata and straight spermatia. 



1. L. lurida Ach. Meth. p. 77 (1803) & Syn. p. 51 (1814).— 

 Thallus imbricato-squamose, appressed, csespitose, lurid or lurid- 

 brown, opaque (K — , CaCl — ) ; squamules orbicular, rigid, 

 smooth, sinuate-lobed. Apothecia moderate, adnate, plane, 

 brownish-black, pale within, the margin obtuse, slightly flexuose, 

 at length convex and immarginate ; hypothecium thick, dark- 

 brown ; paraphyses stout, coherent, reddish-brown at the 

 apices ; spores ellipsoid or oblong-ellipsoid, 0,013-15 mm. long, 

 0,005-7 mm, thick ; hymenial gelatine slightly bluish then 

 wine-red with iodine. — Hook. Fl. Scot. ii. p. 40 ; Carroll in Nat. 

 Hist. Rev. vi. p. 525 ; Cromb. Lich. Brit. p. 64 ; Leight. Lich. 

 Fl. p. 252 ; ed. 3, p. 244. Lichen luridus Sw. in Nov. Act. Upsal. 

 iv. p. 247 (1784) ; Dicks. Crypt, fasc. ii. p. 20 ; With. Arr. ed. 3, 

 iv. p. 28; Engl. Bot. t. 1329. Lepidoma luridum S. F. Gray 

 Nat. Arr. i. p. 460 (1821). Psora lurida DC. Fl. Fr. ii. p. 370 

 (1805); Mudd Man. p. 170. Lichenoides pulmonarius saxatilis 

 viridis, etc.. Dill. Hist. Muse. p. 228, t. 30. f. 134 (1740). 



Exsicc. Dicks. Hort. Sice. n. 25 ; Cromb. n. 79 ; Larb. Ceesar. 

 n. 31, Lich. Hb. n. 340. 



When sterile and only spermogoniiferous might readily be taken for 

 an Endocarpon allied to E. hepaticum Ach. In more shady situations 

 the thallus is occasionally pale-brown, with the squamules more 

 concrete, when it is form pallescens Th. Fr. Lich. Scand. p. 414 

 (1874), a condition which rarely occurs in this country. The apothecia 

 are generally rather scattered and in age become black. 



Hab. On calcareous soil among rocks in maritime and upland 

 districts. — Distr. Here and there in Great Britain and the Channel 

 Islands, though plentiful where it occurs ; not seen from Ireland. — 

 B. M. St. Ouen's Bay and Portelet Bay, Jersey ; Saints' Bay, 

 Guernsey ; above Anstey's Cove, Torquay, Devon ; Yatton, Here- 

 fordshire ; Cheddar Cliffs and Bathford Hill, Somerset ; Cunning 

 Dale, near Buxton, and above Cromford, Derbyshire ; Dolgelly, 

 Merioneth ; Great Oriue's Head, Carnarvonshire ; Teesdale and 

 Eglestone, Durham ; Cumberland ; King's Park, Edinburgh ; Island 

 of Lismore, Argyll; Ben Lawers, Perthshire; Clova Mts., Forfar; 

 Craig Guie, Braemar, Aberdeenshire. 



2. L. globifera Ach. Lich. Univ. p. 213 (1810).— Thallus 

 squamoso-imbricate, somewhat shining, areolate, reddish-brown 

 or chestnut-red, paler beneath (K — , CaCl — ); squamules reni- 

 form, rigid, roundly lobed, flexuose, subhorizontal. Apothecia 

 small, prominent, convex, at length globose, immarginate, often 

 conglomerate, brown or brownish-black, pale within ; paraphyses 

 coherent, reddish-brown at the apices ; hypothecium thin, 

 brownish; spores subellipsoid, 0,012-15 mm. long, 0,005-6 mm. 

 thick ; hymenial gelatine slightly bluish then wine-red with 



