242 GllArillDEI [OPEGIUI'UA 



Var. siderella Nyl. in Mem. Hoc. Sci. Nat. Cherb. v. p. 131 

 (1857) & m Act. Soc. Linn. Bord. ser. 3, i. p. 405 (1856).— 

 Thallus usually smooth. Apothecia narrow, often slightly 

 flattened, growing in more or less radiate-stellate groups ; 

 spermogones with shorter slightly-bent or straight spermatia 

 0,003-6 mm. long, 0,001 mm. thick.— Mudd Man. p. 233. 

 Var. suhsiderella Nyl. Lich. Scand. p. 255 (1861); Cromb. 

 Lich. Brit. p. 99 ; f. suhsiderella Leight. Lich. Fl. p. 385 (1871) ; 

 ed. 3, p. 407. 0. hapaleoidesNyl in Flora Hi. p. 296 (1869)? 

 Cromb. in Journ. Bot. xi. p. 135 (1873); Leight. Lich. Fl. 

 ed. 3, p. 408. Lichen siderellus Ach. Lich. Suec. Prodr. p. 24 

 (1798)? 



Exsicc. Mudd n. 212; Larb. Lich. Hb. n. 78 (as 0. 

 hapaleoides). 



Hah, On bark of trees. — Distr. Somewhat rare throughout Great 

 Britain. — B. M. Near Lustleigh, Devon ; near Brockenhurst, New 

 Forest, Hants ; near Lewes, near Poynings Springs, Beeding and 

 Blatchington, Sussex ; Broomfield and Becking, Essex ; Alfrick and 

 Norton, and near Claines,Worcestershire ; Dolgelly, Merioneth ; Easby, 

 Cleveland, Yorkshire ; Nannau, Dolgelly, Merioneth ; Barcaidine, 

 Argyll ; Kenmore, Perthshire ; Carrigaloe, near Cork ; Muckruss 

 Demesne, Killarney, Kerry ; Doughruagh Mt., Glendalough and Kyle- 

 more, Connemara, Galway. 



18. 0. areniseda Nyl. in Flora Iviii. p. 446 (1875).— Thallus 

 scarcely visible. Apothecia black, linear, very long, massed 

 in small heaps ; disc narrow ; hypothecium blackish-brown ; para- 

 physes slender, branched, conglutinate ; spores colourless, fusiform, 

 3-5-septate, up to 0,030 mm. long, 0,004-6 mm. thick ; spermo- 

 gones heaped in small groups with straight spermatia, 0,0035-45 

 mm. long, 0,001 mm. thick. — Cromb. in Journ. Bot. xiv. p. 362 

 (1876) ; Leight. Lich. Fl. ed. 3, p. 406. 0. actopUla Nyl. in 

 Flora Ixiii. p. 13 (1880); Cromb. in Grevillea viii. p. 113 & 

 in Journ. Bot. xx. p. 276 (1882). 



Nylander gives spore measurements as 0,014-16 mm. long ; when 

 fully developed, however, they measure from 0,020-80 mm. in length, 

 and are usually 5 -septate. 



Hah. On sandy soil and old wood. — Distr. Very rare in the 

 Channel Islands (Jersey). — B. M. On sandy soil: Noirmont and 

 Belcroute Bay. On decayed rafters : St. John's. 



19. 0. zonata Koerb. Syst. Lich. Germ. p. 279 (1855).— 

 Thallus reddish or reddish-brown, thin, subtartareous, smoothish, 

 with numerous yellowish-white soredia, limited and intersected 

 by raised blackish lines formed by the hypothallus. Apothecia 

 small, brownish-black, scattered, shortly oblong or round, the 

 margins elevated, often resembling the perithecium of a Verru- 

 caria ; hypothecium subtended by a thinnish black line, colourless 

 or brownish ; paraphyses conglutinate ; spores elongate-fusiform, 

 5-septate, 0,016-21 mm. long, 0,003-4 mm. thick. — Leight. Lich. 



