280 PTKENOCAKPEI [VEBBUCARIA 



8. V. rhodosticta Tayl. /. c. — Thallus subtartareous, thin, 

 verrucose, the verrucae aggregate, purplish-black when diy, sub- 

 gelatinous and reddish when moist, minutely wrinkled ; perithecia 

 scattered, subglobose, scabrid. Specimen not seen. 



Considered bv Taylor as allied to the previous species, also referred 

 by MiiUer-Argau (torn. oit. p. 551) to Pyrenopsis. The descriptions 

 of both species ar? too incomplete for accurate identification. 



Hob. On wet rocks near Sheen Bridge, Kerry. 



9. V. hydrela Ach. Syn. p. 94 (1814): Garovaglio Tent. 

 Disp. Meth. Lich. p. 22, t. 1, f. 2 (1864). — Thallus olivaceous or 

 olive-brown, effuse or determinate, smooth, thin or often thickish, 

 gelatinous, becoming subtartareous, continuous, then somewhat 

 cracked, smooth, sometimes unequal. Perithecia moderate in 

 size, semi-immersed, the apex alone free, subglobose, black ; 

 perithecia! wall dimidiate or continued below the base in a thin 

 layer ; spores ellipsoid, rather large, 0,019-26 mm. long, 0,008— 

 18 mm. thick. — Mudd Man. p. 285 ; Shackleton i: Hebden in 

 Xaturalist 1892, p. 17. V. Isevata Leight. Angioc. Lich. p. 44, 

 t. 19, f. 1 (1851) pro parte? V. elaeomehena Massal. in Atti. 

 Istit. Ten. 1857, p. 380, t. 5, figs. 1— t. V. margacea var. 

 hydrela X vl. in Maine et Loire, Mem. Soc. Acad. iv. p. 26 (1858) ; 

 Cromb. Lich. Brit. p. 112. lAihoicea elseomelsena Massal. I. c. 



JExficc. Cromb. n. 198 (as V. elseomelsena). 



Distinguished from allied species by the continuous unequal 

 thallus; the spores measure 0,012 mm. thick in the specimens 

 examined. 



Hab. On rocks which are often under water. — Distr. Bare in 

 Central and 'W. England, and the Grampians, Scotland. — ^JS. M. On 

 rocks in streams, Chedworth, Gloucestershire ; Malvern, Worcester- 

 shire ; bed of the Wye, Buxton, Derbyshire. 



10. V. Isevata Ach. Lich. Univ. p. 284 (1810).— ThaUus pale- 

 greyish-brown, rather thick, tartareous, continuous or cracked- 

 areolate, whitish towards the edges and determiEiate with a dark- 

 coloured hypothaUus. Perithecia immersed, the black shining 

 ostiole emerging ; perithecial wall entire, thickish ; spores 8 in the 

 ascus, ellipsoid, large, 0,018-24 mm. long or longer, 0,010- 

 11 nmi. thick; hymenial gelatine wine-red with iodine. — Borr. 

 in Sm. Engl. Bot. Suppl. n. 2623, f. 2 ; Hook, in Sm. Engl. Fl. v. 

 p. 153 : Tayl. in Mackay El. Hib. ii. p. 91 ; Leight. Angioc. Lich. 

 p. 44, t. 19, f. 1 pro parte & Lich. Fl. p. 418; ed. 3, p. 449 ; 

 Mudd Man. p. 286. 



Exsicc. Leight. n. 198 ; Mudd n. 273. 



Closely allied to the preceding but distinguished by the more 

 tartareoxis deeply-cracked areolate thallus and the covered perithecia. 



Hab. On rocks and stones usually in streams. — Distr. In upland 

 districts, rare in X. England, the Grampians, Scotland, and S. and 

 W. Ireland. — B. M. Craigforda and brook between Tugford and 

 Abdon, Shropshire ; Kiver Ithon, Llandrindod, Badnorshire ; Camedd 



