dbematocarpon] deematocarpace^ 269 



2. D. aquaticum A. Zahlbr. Krypt. Exsicc. n. 652 (1901).— 

 Thallus spreading, polyphyllous, rather thick and coriaceous, the 

 lobes crowded, flaccid, crenate and incurved, tumid, ascending in 

 the centre, more flattened at the circumference, green when wet, 

 pale to brownish when dry, the under side naked, pale at first 

 then darker coloured. Perithecia minute, innate, sometimes 

 confluent, with slightly prominent brown ostioles ; spores 8 in 

 the ascus, oblong or ellipsoid, 0,010-16 mm. long, 0,006-9 mm. 

 thick. — Lichenoides imbricatum luridum Dill. Hist. Muse. p. 224, 

 t. 30, f. 128 (1741). Lichen aquaticus Weiss PI. Crypt. Fl. 

 Goett. p. 77 (1770) ; Engl. Bot. t. 594. L. fluviatilis Web. 

 Spioil. Fl. Goett. p. 265, t. 4 (1778); With. Arr. ed. 3, iv. p. 67. 

 L. Weberi Ach. Lich. Suec. Prodr. p, 142 (1798). Endocarpon 

 Weberi Ach. Meth. p. 128 (1803); S. F. Gray Nat. Arr. i. 

 p. 501 ; Hook. Fl. Scot. ii. p. 45 ; Grev. Fl. Edin. p. 329. 

 E.fluviatile DO. Fl. Fr. ii. p. 413 (1805) ; Mudd Man. p. 266; 

 Cromb. Lich. Brit. p. 108; Leight. Lioh. Fl. p. 410; ed. 3, 

 p. 442. E. miniatum var. aquaticum SchEer. Spicil. p. 60 (1826) ; 

 Hook, in Sm. Engl. PI. v. p. 156; Tayl. in Mackay PL Hib. ii. 

 p. 98. 



Exsicc. Larb. Lich. Hb. n. 358 & Lich. Csesar. n. 95. 



Approaches var. complicatum of the preceding species ia the size 

 and form of the thalline lobes, but is well distinguished by its thicker 

 coriaceous character and by the habitat. The lobes, usually rather 

 large and rounded, are occasionally only from 1 to " 5 cm. in width 

 and deeply cut and laciniate. 



Sab. On rocks and stones in streams and lakes. — Distr. Rare, but 

 widely distributed, chiefly in upland districts. — B. M. East coast of 

 Jersey ; Saints Bay, Guernsey ; St. Breock, Cornwall ; River Teign, 

 near Keston, Lydford, the Dart River and Ivy Bridge, Devon ; Tewy 

 Liandyssiel, Cardiganshire ; Harlech Castle and Barmouth, Merioneth ; 

 Ham, Stafibrdshire ; Windermere, Westmoreland ; Eglestone and 

 Teesdale, Durham ; Kincardineshire; Loch Lomond, Dumbartonshire ; 

 Appin, Argyll ; Loch Dochart, Loch Tummel and shores of Loch Tay, 

 KiUin, Perthshire ; shores of Loch Linnhe, Invernessshire ; Killarney, 

 Kerry. 



Var. euplocum A. L. Sm. — Thallus coriaceous, minute, mono- 

 phyllous, affixed to the substratum by a central point, deeply 

 lobed, the margins crisped and recurved, olive-green when moist, 

 greyish or brownish when dry. — Lichen euplocus Ach. Lich. Suec. 

 Prodr. p. 141 (1798). Endocarpon euplocum Ach. Meth. p. 127, 

 t. 3, f. 4 (1803) ; Borr. in Engl. Bot. Suppl. t. 2602, f. 2 ; Hook, 

 in Sm. Engl. Fl. v. p. 157 ; Leight. Angioc. Lich. p. 12, t. 2, f. 3. 

 E. fluviatile var. euplocum Mudd Man. p. 266 (1861); Leight. 

 Lich. PI. p. 41 1 ; ed. 3, p. 443. E. miniatum var. euplocum Wahlenb. 

 Fl. Suec. p. 875 (1826); Cromb. Lich. Brit. p. 107. Verrucaria 

 euploca Borr. in Engl. Bot. Suppl. I. c. text (1831). 



A minute variety of the species bearing the same relation to it as 

 var. leptophyllum does to D. miniatum. 



