326 PTEENOCAKPEI [aETHOPTKENIA 



23. A. leptotera A. L. Sm. — Thallus dark-oKvaceous-green, 

 somewhat gelatinous, smooth or cracked in drying, subdeter- 

 minate. Perithecia black, minute, subinnate ; perithecial wall 

 dimidiate ; paraphyses breaking up or obsolete ; asci oblong, 

 ovate ; spores oblong-clavate, 1-septate, the upper cell rather 

 thicker, colourless, 0,016-18 mm. long, 0,005 mm. thick. — 

 Verrucaria leptotera Xyl. in Flora xlviii. p. 212 (1865). 



Distinguished from A. litoralis by the subgelatinous thaUus 

 and immersed apothecia. 



Hah. On maritime rocks. — Distr. Bare iu the Channel Islands. — 

 B. M. Greve-au-Lancon, Jersey. 



24. A. halodytes Ohv. Exp. Syst. Lich. France ii. 2, p. 261 

 (1901). — Thallus oHvaceous-brown or blackish, thin, continuous or 

 sparsely cracked, somewhat gelatinous. Perithecia small, black, 

 slightly prominent, becoming impressed above, numerous and 

 somewhat congregate, intermixed with spermogones ; perithecial 

 wall dimidiate ; paraphyses few, irregular ; asci inflated ; spores 

 oblong, 1-septate, slightly thicker at one end, 0,013-15 mm. 

 long, 0,005-7 thick. Verrucaria halodytes Nyl. in Mem. Soc. 

 Sci. Nat. Cherb. v. p. 142 (1857). V. fluctigena Nyl. in Flora 

 Iviii. p. 14 (1875) (fide "Weddell in Mem. Soc. Sci. Nat. Cherb. 

 xix. p. 307 (1875) ) ; Leight. Lich. Fl. ed. 3, p. 462. 



Differs from the preceding in the more prominent perithecia and 

 in the shorter asci and spores. Xylander's specimen from Cherbourg 

 is olivaeeous-green in colour. Weddell (Z. c.) describes the thaUus as 

 brown or brownish-black ; he also adds a note on the algal symbiont, 

 which, according to Bomet, is Glceocapsa crepidinum Thur., one of the 

 Phycochromophycese. V. fluctigena has been referred by A. Zahl- 

 bruckner (Krypt. eisicc. n. 469) as a, synonym to A. Kelpii Koerh. 

 (Parerg. Lich. p. 387 (1868) ). 



Hab. On maritime rocks, washed by the waves. — Specimen cited 

 by Leighton {I. c.) (under T". fluctigena) as from Crombie, but not 

 found in Herb. Crombie. 



Var. HoUii A. L. Sm. — Thallus duU-black, widely spreading, 

 very minutely cracked-areolate. Perithecia as in the species. 



The minute areolation, visible only with a high magnification, 

 gives the thallus a somewhat scabrid look. The specimen was 

 collected by H. B. HoU. 



Mah. On rocks near the sea. — Bistr. Bare in W. Wales. — B. M. 

 On the road between Barmouth and DolgeUy, Merioneth. 



25. A. halizoa A. L. Sm. — Thallus thin, efiuse, continuous, 

 pale - olivaceous or sage - green. Perithecia minute, black, 

 scattered, prominent or semi-immersed ; perithecial wall dimi- 

 diate or subentire ; paraphyses scanty, distinct ; asci cylindrical 

 or slightly swollen ; spores oblong-ovate, colourless, 1-septate, 

 the upper cell sometimes larger, 0,010-12 mm. long, 0,005-7 mm. 

 thick ; hymenial gelatine yellow with iodine. — Verrucaria halizoa 

 Leight. Lich. Fl. p. 436 (1871); ed. 3, p. 461. 



