RAMALIXA.] RAMALINEI. 187 



has shown tl)at the chemical reactions of the medulla with K, the differ- 

 ences in the receptacle uf the apothecia, the form and size of the .'-pores 

 and spermatia, aflord invaluable aid in the discrimination of species. The 

 number of species have been consequently largely increased, and varieties 

 more definitely referred to their species. As compared with other Euro- 

 pean coimtrjes, the genus has a very fair number of species and varieties 

 in Great Britain, all belonging to Xylander's Spction C, which is charac- 

 terized by the spermogcmes having pale or colourless conceptacles. 



a. Thallus attenuate, fruticulosc, subrounded or subcompressed ; 

 cortical layer filamentose. 



1. E. thransta Xyl. Bull. See. Linn. Xormand. ser. 2, iv. (1870) 

 p. 116. — Thallus elongate, pendulous or prostrate, filiform, sub- 

 rounded, here and there compressed, verv' much branched, smooth, 

 somewhat shining, pale straw-coloured ; laciniae ven,- slender, densely 

 interwoven, the apices unequally capillari- attenuate (medulla K — ). 

 "Apothecia superficial, sessile, minute, plane, pale, the margin very 

 thin ; spores straight.'' — Cromb. Journ. Eot. 1872, p. 71 ; Leight. 

 Lich. Fl. ed. 2, p. 470, ed. 3, p. 83. — Ramalina cal icaris, rar. thraiisia 

 Cromb. Lich. Brit. p. 25 pro parte ; Leight. Lich. Fl. p. 94 pro 

 parte. AUctoria ihrausta Ach. Lich. Univ. (1810) p. 596. 



The thallus, which is somewhat Alectorioid, is very fragile when dry, 

 and in the few British specimens gathered is destitute of the soredia, 

 with which it is elsewhere sometimes sprinkled. The apothecia. which 

 are not well known, are absent from Qur specimens, which are also without 

 spermogones. 



Hab. On sandy soil amcng short heath in maritime tracts. — Distr. 

 Very sparingly in one spot on the X.E. coast of Scotland. — B. M. : Bay 

 of X\gg, Kincardineshire (now extinct). 



h. Thallus compressed, longitudinally striato-nerved or subcostato- 

 unequal ; coitical la} er filamentose. 



2. R. calicaris Xyl. Bull. Soc. Linn. Xormand. se'r. 2, iv. (1870) 

 p. 131. — Thallus subrigid, compressed, linear or lineari-laciniate, 

 pale glaucous or greyish green, laciniae sublacunosely longitudinally 

 nervoso-rugose, usually canaliculate (medulla K— ). Apothecia 

 pedicellate, marginal and terminal, small or moderate, pale flesh- 

 coloured or glaucescent, the receptacle rugose beneath ; spores 

 straight, ellipsoid, 0,010-16 mm. long, 0,005-7 mm. thick. — Cromb. 

 Grevillea, xv. p. 47 ; Lich. Brit. p. 2b pro parte ; Leight. Lich. FL 

 ed. 3, p. 83. — RamaJina calicaris y. canalicidata Ft. Mudd, Man. 

 p. 73, t. 1. f. 17 ; Leight. Lich. Fl. p. 92. Ramalina fasti</iata ft^ 

 calicaris Hook. Fl. Scot. ii. p. 68 pro parte ; Tayl. in Mack. Fl. Hib. 

 ii. p. 85. Loharia calicaris Hoffm. Deutsch. Fl. ii. (1795) p. 139 

 pro parte. Lichen calicaris Huds. Fl. Angl. p. 451 pro parte ; Lightf. 

 Fl. Scot.ii. p. 834 pro parte; With. Arr. ed. 3, iv. p. 51 pro parte. 

 Lichen fastu/iatas Eng. Bot. t. 890 (upper fig.). Ramalina fastiijiata 

 Sm. Eng. Fl. v. p. 225 pro parte. Lichenoides coralliforme rostratum et 

 canaliculatwn Dill. Muse. 170, t. 23. f. 62 a. — Lichenoides arboreum 



