THE ANNALS 
AND 
MAGAZINE OF NATURAL HISTORY. 
[THIRD SERIES. ] 
No. 84. DECEMBER 1864. 
XLIII.— New British Lichens. 
By the Rev. W. A. Lricuton, B.A., F.B.S.E. 
[Plate IX. ] 
TueExocarpon, Nyl. 
Apothecia granuloso-verruciform, ostiole punctiform. Nucleus 
gelatinous, colourless. Perithecium subceraceous. Paraphyses 
slender, flexuose. Asci ventricoso-fusiform. Sporidia innu- 
merable, minute, ellipsoid, hyaline, with an indistinct nucleus 
at each extremity. Thallus thin, crustaceous. 
Thelocarpon Laureri (Flot.). 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. 
Spheropsis Laureri, Flot. in Bot. Zeit. 29 Jan. 1847, p. 65. 
Thelomphale Laureri, Flot. in lit. (1848) fide Korber, Par. Lich. p. 321; 
Korber, Par. Lich. 321 (1863). 
Thelocarpi, sp., Nylander, Classif. i. 15 (1854). 
Thelocarpon Laurert, Nylander, Lich. Algerie, p. 338 (Aug. 1854); Nyl. 
Classif. i. p. 190 (June 1855); Nyl. Prodr. p. 173 (1857); Nyl. Py- 
renocarp. p. 10 (1858); Nyl. Enum. p. 135 (1858); Leight. Lich. Brit. 
Exsic. fase. xu. 35] (1864). 
Thallus (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 citrme 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. & Mag. N. Hist. Ser.3. Vol. xiv. 
