DERMATOCARPON] DERMATOCARPACEiE 267 



101. DERMATOCARPON Eschw. Syst. Lich. p. 21 (1824) 

 emend. ; Th. Fr. Lich. Arct. p. 252 (1860). (PI. 37.) 



Thallus leafy or squamulose, corticated on both surfaces or 

 only on the upper surface, sometimes with rhizin£e. Algal cells 

 Pleurococcus. Perithecia simple, immersed in the thallus, globose 

 or ovate, with a projecting ostiole ; paraphyses usually mucila- 

 ginous and cohering, or sparingly developed and branched ; asci 

 8-16-spored; spores simple, colourless. fSpermogones divided into 

 hollow chambers, opening by a slit. 



1. D. miniatum Th. Fr. Lich. Arct. p. 253 (I860).— Thallus 

 spreading, ashy-grey or whitish, leafy, peltate, coriaceous, rather 

 large, rounded or somewhat crenate-lobate, smooth or minutely 

 granular-pruinose, attached by a central point to the substratum, 

 the under surface tawny or brownish, smooth or wrinkled. 

 Perithecia minute, numerous, immersed, with a prominent brown 

 ostiole ; spores 8 in the ascus, oblong or ellipsoid, 0,010-16 mm. 

 long, 0,006-9 mm. thick. — Liclienoides coriaceum nehulosum 

 cinereum punctatum, subtiis fuhum Dill. Hist. Muse. p. 223, t. 30, 

 f. 127b. (1741). Lichen miniatus L. Sp. PI. p. 1149 (1758); 

 Huds. Fl. Angl. p. 454 ; Lightf. Fl. Scot. ii. p. 857 ; Witli. Arr. 

 ed. 3, iv. p. 66 ; Engl. Bot. t. 593, two upper figs. Endocarpon 

 miniatum Ach. Meth. p. 127 (1803); S. F. Gray Nat. Arr. 

 i, p. 501 ; Hook. Fl. Scot. ii. p. 44 & in Sm. Engl. Fl. v. p. 156 

 pro parte; Grev. Fl. Edin. p. 329 ; Tayl. in Mackay Fl. Hib. ii. 

 p. 98 pro parte; Mudd Man. p. 265; Cromb. Lich. Brit. p. 107 

 pro parte; Leight. Lich. Fl. p. 409; ed. 3, p. 441. E. miniatum 

 var. umbilicatum Hook, ex Leight. Angioc. Lich. p. 11, t. 1, f. 4 

 (1851). 



Exsicc. Dicks. Hort. Sice. n. 24 ; Bohl. n. 1 ; Leight. n. 26 ; 

 Mudd n. 255; Larb. Lich. Csesar. n. 94; Cromb. n. 100; Johns. 

 n. 400, 



Hab. On dry rocks in maritime or mountainous districts. — Distr. 

 Somewhat common throughout the British Isles. — B. M. L'Etacq, 

 Beaufort and Bezel Tower, Jersey ; Petit-Bot Bay, Guernsey ; Tintagel 

 and Pen tire, St. Minver, Cornwall ; Torquay, Ilsham and near Cock- 

 ington, Devon ; Leigh Wood and Cheddar Cliffs, Somerset ; St. Vin- 

 cent's Rocks, Gloucestershire ; Manorbeer Castle, Pembrokeshire ; 

 Harlech Castle, Merioneth ; near Conway, Carnarvonshire ; near 

 Beaumaris, Anglesea ; Puffin Island ; Miller's Dale, Derbyshire ; 

 Trowgill, Clapham, Yorkshire ; Rokeby, Durham ; Egremont, Cumber- 

 land ; Falls of Clyde, Lanarkshire ; Craiglockhart, near Edinburgh ; 

 Bowling, Dumbartonshire ; near Dunkeld, Kenmore and Glen Lochay, 

 Perthshire ; I. of Lismore, Argyll ; Craig Guie, Braemar, Aberdeen- 

 shire ; near Glencorbot and Kylemore, Connemara, Galway. 



Var. leptophyllum Dalla Torre & Sarnth. Fl. Tirol, p. 503 

 (1902). — Thallus small, peltate, solitary or of several lobes, 

 greyish or dark-brown, the under surface dark-coloured. — Lichen 

 leptophyllus Ach. Lich. Suec. Prodr. p. 141 (1798); Engl. Bot. 

 t. 2012, f. 2. Endocarpon leptophyllum Ach. Meth. p. 127 (1803) ; 



