190 LECANO-LECIDEEI [kHIZOCABPOX 



Hab. On rocks and stones. — I^istr. General and comnaon in the 

 Channel Islands and England and 'VTales. Somewhat rare in Ireland, 

 rare in Scotland. — B. M. Green Island, Jersey ; near Lewes, Xewhaven 

 and Downs, Sussex ; Xewlyn Cliff, Cornwall ; Shanklin, I. of Wight ; 

 near Cirencester and Selsby Hill, Gloucestershire ; 'VTalthamstow, 

 Little Baddon and 'Wickham Bishops, Essex; Twj-cross, Leicester- 

 shire; near Tenby, Pembrokeshire; Llangollen, Denbighshire; Mal- 

 vern, "Worcestershire ; near Yarmouth and Market Dereham, Xorfolk ; 

 Cherry Hinton Church, Cambridgeshire ; Pinching Thorpe Wood and 

 near Ayton. Cleveland, Yorkshire; Hartside Fell, Cumberland; Ben 

 Lawers, Perthshire ; near Cork ; Ross, Clare ; Killery Bay, Letter- 

 more and Doughruagh Mt., Connemara, Galway. 



4. Rh. chlorophseum A. L. Sm. — ^ThaUus yellowish-white, 

 warted or cracked-areolate, unequal, scattered or snbdetenninate 

 (K + yeUow, then red). Apothecia small, subinnate-sessile, 

 black, slightly pruinose, plane or convex ; hypothecium dark- 

 brown ; paraphyses rather stout, discrete, thickened and brown 

 at the tips ; spores dark-brown, oblong, 3-septate and irregularly 

 mui-iform, brown, without an epispore, 0,015—20 mm. long, 

 0,010-12 mm. thick ; hymenial gelatine blue with iodine. — 

 Lecidea cMorophsea Hepp. ex Leight. Lich. PI. p. 328 (1871); 

 ed. 3, p. 318. 



Closely allied to f. ejiijiolia of the preceding species, but differing 

 in the more constantly muriform spores and in the thaOine reaction. 



Hah. On rooks and flints. — Distr. Eare in S. England and S. 

 Wales. — B. M. S. England ; Tenby, Pembrokeshire. 



5. Rh. soreumidium A. L. Sm. — ^Thallus pale or pallid-greyish, 

 thickish, wrinkled or wart«d-congested, limited (K — , CaCl — ). 

 Apothecia crowded, sessile, small at first, plane, wTinkled, 

 margined and bluish-grey-pruinose, becoming convex and im- 

 marginate and often connate ; hypothecium dark-brown or 

 brownish ; paraphyses indistinct, somewhat irregular, dark-brown 

 at the tips and granular-inspersed ; spores ellipsoid, 3-septate and 

 generally muriform, brown, 0,013-20 mm. long, 0,008-10 mm. 

 thick ; hymenial gelatine deep-blue with iodine. — Lecidea soreu- 

 midia Stirton in Scott. Nat. iv. p. 29 (1877); Leight. Lich. 

 Fl. ed. 3, p. 375. Specimen not seen. 



Perhaps only a form of EJi. alboatrum. 



Hab, On dead wood. — Distr. Alpine districts in Scotland (Ben 

 Brecht, -ii-gj-U). 



6. Rh. geographicum DC. Fl. Fr. ii. p. 365 (1805).— Thallus 

 citrine or bright-greenish-yellow, deteiininate, thickish or rather 

 thin, areolate, the areolae smooth, plane, contiguous or sub- 

 contiguous (K — , CaCl — , medulla I -j- bluish) ; hypothallus 

 black. Apothecia small or moderate in size, innate, plane or 

 somewhat convex, marginate, black ; hypothecium blackish ; 

 paraphyses conglutiQate, variously dark-coloured at the apices ; 



