200 i.icHEXACEr. [kamalina. 



Hob. On rocks in niaritime districts. — Distr. Very local thougli plen- 

 tiful where it occurs, in the Channel Islands and S.W. England. — B. M. : 

 Mont Orgueil, Island of Jersey. Near Land's End and Penzance, Cornwall ; 

 St. Mary's, Scilly. 



13. R. geniciQata Hook. & Tayl. Lend. Journ. Bot. 1844, p. 655. 

 — Thallus moderate or somewhat small, subrounded or subcom- 

 pressed, smooth, or obsoletely longitudinally subnervose, csespitosely 

 and subfastigiately branched, pale or pale straw-coloured, often 

 terebrate with scattered perforations, listulose within ; branches 

 usually attenuate (medulla K — ). Apothecia small, terminal or sub- 

 terminal, pale-testaceous or glaucous-white, the receptacle smooth 

 or rugulose ; spores oblong or fusiformi-oblong, straight (or obso- 

 letely slightly curved), 0,009-0,015 mm. long, 0,004-7 mm. thick. 

 — Xyl. Bull. Soc. Linn. Xormand. ser. 2, iv. p. 163 : Cromb. Journ. 

 Bot. ] S70, p. 360 ; Leight. Lich. PI. ed. 3, p. 90. 



Resembles R. pusiUa Le Prey., a plant found in Portugal but not 

 reaching our Islands : it is distinguished by the cortical texture and the 

 shining, smooth, and more freely di\-ided thallus. To the following species 

 also it presents seyeral points of alliance. It is interesting as one of the 

 exotic plants which extend to AV. Ireland. In the British specimens the 

 apothecia, which are appendiculate, are yery sparingly present. 



Hah. On stems of shrubs (thorns) in maritime districts. — Distr. Ex- 

 tremely local and scarce in N.W. Ireland, though we may expect to find 

 it in the S.AV. also. — B. M. : Killery Bay, Counemara, co. Gahvay. 



14. R. minuscula Xyl. Bull. Soc. Linn. Xormand. se'r. 2, iv. 

 (1870) p. 104. — Thallus small, subrounded, shining, soft, subpel- 

 lucid, very finely longitudinally striatulate, caespitosely branched, 

 straw-coloured or pale straw-coloured, branches attenuato-ramulose 

 (medulla K — ). Apothecia small, terminal, plane or conyex, yel- 

 lowish flesh-coloured or glaucous, the receptacle smoothish beneath ; 

 spores oblong or fusiformi-oblong, straight, 0,009-0,015 mm. long, 

 0,004-6 mm. thick. — Cromb. GreviUea, vii. p. 142. — Ramalina 

 adcaris f. minuscula Xvl. Siillsk. pro F, et Fl. Fenn. Forh. n. s. v. 

 (1866) p. 114. 



This might be taken for a small, narrow state oi R.fastir/iata, or for a 

 young condition of R. calicnris. It is, however, a very dis^tinct species, 

 differing from the preceding in the smaller and softer thallus, which is 

 scarcely more than \ inch in height ; it occasionally presents small scat- 

 tered oblong perforations. In British specimens the apothecia are very 

 rare. 



Hob. On the branches of stunted larches, and erratic on rocks in 

 a wooded mountainous district. — Distr. Very local and scarce, found only 

 amon^' the N. Grampians, Scotland. — B. M. : Craig Climy, Braemar, 

 Aijerdeensliii'e. 



