336 PYRENOCARPEl [pORINA 



var. fusi/ormiti). S(((jcdla llarrimanni Koetb. Syst. Lich. Germ, 

 p. 362 (1855). 



Exsicc. Mudd 11. 288 (as A, macular is) ; Loi^ht. n. 138 (as 

 V. codonoidea) ; Larb. Lich. Hb. n. 197 (as V. Harrimanni), 

 without number. 



Tho type specimen of V. ^jer77wn?/^^rt in the British Museum 

 has 4-celled spores, and is otherwise similar to P. clilorotica. 

 Several species or varieties have been founded on slight differences 

 of pcritliecia and of the thallus, which varies from greyish-green 

 to dark-brown in colour. The specimen of Vcmtcaria trachona 

 from Acharius in the possession of the Linnean Society is a 

 spcrmogonial form, possibly of P. chlorotica. In the Sowerby 

 herbarium there is a specimen of P. chlorotica from Miss Hutchins, 

 the original collector of V. trachona, in Ireland, but the specimen has 

 been labelled by Borrer as Verrucaria viridula, and does not altogether 

 correspond with the one figured in Engl. Bot. 



Hah. On rocks. — Distr. Not uncommon in the Channel Islands, 

 England, Wales, and Ireland ; not recorded from Scotland. — B. M. 

 Jerbourg, Guernsey ; Boulay Baj^ La Coupe, Kozel and Trinity, Jersey ; 

 Withiel, Cornwall ; Torquay, Devon ; Bathford Hill and Weston-super- 

 Mare, Somerset ; Barnsley Park, Gloucestershire ; Haughmond Hill, 

 Shropshire ; Bettws-y-Coed and Trefriw, Carnarvon ; Buxton, Derby- 

 shire ; Bilsdale, near Ayton, Cleveland, Yorkshire ; Blackwater and 

 Derriquin, Killarney, Kerry ; Kylemore, near Tully, Doughruagh and 

 Glen Tuagh, Connemara, Galway ; Cliffs of Moher, Clare. 



Var. persicina A. L. Sm. — Thallus whitish or sometimes rose- 

 coloured or purplish-red. Spores more obtuse at the ends than 

 in the sjjecies. — Verrucaria linearis Leiglit. Angioc. Lich. p. 52, 

 t. 23, fig. 1 (1851) ifeLich. Fl p. 441; ed. 3, p. 475; Cromb. 

 Lich. Brit. p. 116. V. chlorotica i. persicina Nyl. in Maine et 

 Loire Mem. Soc. Acad. iv. p. 36 (1858). Sagedia persicina 

 Koerb. Syst. Lich. Germ. p. 364 (1855). Arthopyrenia linearis 

 Mudd Man. p. 300 (1861) e descript. 



Leighton (Angioc. Lich. p. 52) refers to this variety as the small 

 lichen figured along with V. Dufourii in Engl. Bot. Suppl. t. 2791. 



Hah. On calcareous rocks. — Distr. Eare in N. and S.W. England 

 and W. Ireland. — B. M. Woodale, Buxton, Derbyshire ; in a cave, 

 Derryclare, near Kylemore, Conneinara, Galway. 



8. P. tePxUifera A. L. Sm. — Thallus dark-grey or blackish, 

 thin, continuous or cracked. Perithecia minute, black, hemi- 

 spherical with a minute ostiole ; perithecial wall dimidiate ; 

 paraphyses slender, distinct ; spores colourless, elongate-acicular, 

 3-septate, 0,029-35 mm. long, 0,003-4 mm. thick. — Verrucaria 

 tenuifera Nyl. in Flora lix. p. 237 (1876) ; Cromb. in Grevillea v. 

 p. 29 ; Leight. Lich. Fl. ed. 3, p. 476. V. pertenuis Leight. in 

 Trans. Linn. Soc. ser. 2, i. p. 239, t. 32, fig. 20 (1878) & Lich. Fl. 

 ed. 3, p. 476. 



There is no specimen of V. tenuifera in the British Museum, 

 but Larbalestier, states that the specimen of V. pertenuis, collected 



