THE ANNALS 



Airs 



MAGAZINE OF NATURAL HISTORY. 



[THIRD SERIES.] 

 No. 84. DECEMBER 1864. 



XLIIL— iViw British Lichens. 



By the Rev. W. A. Leighton, B.A., F.B.S.E. 



[Plate IX.] 



Thelocarpon, Nyl. 



Apothecia granuloso-verruciform, ostiole punctiform. Nucleus 

 gelatinous, colourless. Perithecium subceraceous. Paraphyses 

 slender, flexuosc. Asci ventricoso-fusiform. Sporidia innu- 

 merable, minute, ellipsoid, hyaline, with an indistinct nucleus 

 at each extremity. Thallus thin, crustaceous. 



Thelocarpon Laureri (Plot.). Thallus crustaceous, somewhat 

 furfuraceous, thin or evanescent, brownish grey ; apothecia scat- 

 tered, minute, granuloso-verrucose, of a citrine-yellow colour; 

 ostiolum slightly depressed, inconspicuous; sporidia in ventricoso- 

 fusiform asci, numerous, minute, ellipsoid, obsoletely polari- 

 nucleate, hyaline. 



5pi«erepm Laureri, Plot, in Bot. Zeit. 29 Jan. 1847, p- 65. 

 TkeUmphale Laureri, Plot, in lit. (1848) fide Korber, Par. Lich. p. 321 ; 



Korber, Par. Lich. 321 (1863). 

 Thelocarpi, sp., Nylander, Classif. i. 15 (1854). 

 Thelocarpon Laureri, Nvlander, Lich. Algerie, p. 338 (Aug. 1854) ; NyL 



Clasaif. ii. p. 190 (/une 1855); Nyl. Prodr. p. 1/3 (1857) ; Nyl. P^- 



renocarp. p. 10 (1858) ; Nvl. Enum. p. 135 (1858) ; Leight. Lich. Brit. 



Exiic. fittc. xii. 351 (1864). 

 Thallm (or what appears to be such) very thin, crustaceous, 

 either uniform or not unfrequently breaking up into furfuraceous 

 flakes, then becoming scattered, and often evanescent, of a dirty 

 or brownish-grey colour. Apothecia very minute, apparently 

 primarily emerging gradually from the thallus, ultimately sessile 

 and enlarged, irregularly scattered, globular, of a citrine yellow 

 colour. The exterior coat of the apothecium appears to be formed 

 of large, rounded, citrine- coloured cells, each containing several 

 round gonidia, and, under the microscope, presents a slightly 

 Ann. i^ Mag. N. Hist. Ser.3. Fo/.xiv. 26 



