282 PYRENOCAKPEI [VBREDCARIA 



Hah. On rocks. — IHstr. Bare in W. Ireland.— B. M. Kylemoie, 

 Connemara, Galway. 



14. V. sethiobola "VTahlenb. ex Ach. Meth. Suppl. p. 17 

 (1803). — ThaUus dark-oUvaceous, effuse, thin, gelatinous when 

 moist, sometimes slightly cracked. Perithecia moderate in size, 

 numerous, black, at first covered by the thallus, then emergent ; 

 perithecial wall entire or thinly developed at the base ; spores 

 ellipsoid, 0,014-24 mm. long, 0,006-010 mm. thick; hymenial 

 gelatine wine-red with iodine. — V. margacea var. aetliidbola Nyl. 

 Lich. Scand. p. 272 (1861) ; Cromb. lich. Brit. p. Ill ; Leight. 

 Lich. Fl. p. 416 ; ed. 3, p. 447. V. detergescens Nyl. in Flora 

 Lc. p. 462 (1877)? Cromb. in GreviUea vi. p. 114 ; Leight. Lich. 

 Fl. ed. 3. p. 448. 



Exsicc. Leight. n. 32 (as V. irrigua Tayl. var. erysiboda 

 Leight.). 



V. devergescens has been included as the specimen in the British 

 Museum bearing the same date and from the same locahty, as the 

 type is identical with V. cethiobola. Xylander gives a larger size for 

 the spores, 0,019-29 mm. long. 



Hob. On wet rocks. — THstr. Rather rare in S.W. and N. England 

 and in S. and W. Ireland. — B. M. "Withiel, Cornwall; Dartmouth, 

 Devon ; Fishguard, Pembrokeshire ; Dolgellv, Merioneth ; Ffridd-du, 

 near Aber, Carnarvonshire ; Ayton, BUsdale and Sowerdale, Cleveland, 

 Yorkshire ; near Ballinhassig and near Cork ; Caher Mt., Dunkerron 

 and Blackwater Bridge, Kerry; Doughruagh Mt. and Letterftack, 

 Connemara, Galway. 



Tar. aCTOtella A. L. Sm. — Thallus evanescent. Perithecia 

 hemispherical, crowded or scattered, the perithecial wall spread- 

 ing at the base ; spores as in the species ? — Y. acroteUa Ach. 

 Meth. p. 123 (1803)? Tayl. in Mackay Fl. ffib. ii. p. 94: 

 Cromb. Lich. Brit. p. 115 (excl. syn.). V. margacea var. 

 acrotella Leight. Lich. Fl. p. 417 (1871) ; ed. 3, p. 448 (excl. 

 syn.). Lichen acrotellus Sm. Engl. Bot. t. 1712 (1807). Lithocia 

 striatula var. acrotella S. F. Gray Nat. Arr. i. p. 498 (1821). 



Considered by Continental botanists to represent a form allied to 

 V. cethiobola but always imperfectly developed. The Sowerby 

 specimen has no spores, but one from Ireland, determined by 

 Nylander as V. acroteUa, though without thaUns, has minute 

 scattered apothecia and spores 0,021 mm. long, 0,007 mm. thick. 



Hob. On stones. — IHstr. Bare in S. England and in S.W. and N. 

 Ireland. — B. M. Withiel, Cornwall ; Aldington Beach, Kent ; Ireland. 



15. V. submersa Schser. Spicil. p. 334 (1836) (non Borr.).— 

 Thallus determinate, thin, smooth, greenish when moist, becoming 

 darker when dry, here and there slightly cracked. Perithecia 

 small, immersed, then semi-emergent, sometimes surrounded at 

 the base by a slight elevation of the thallus ; perithecial wall 

 dimidiate or continuous under the base in a thin layer ; spores 

 eUipsoid, 0,015-24 mm. long, 0,006-010 nun. thick.— Mudd Man. 



