PERTUSARIA.] LECAKO-LECIDEET. 493 



2. P. dactylina Nyl. Act. Soc. Sc. Fenn. t. vii. (18fi3) p. 447 

 (nota 1). — Thallus thin, unequal, papillato-dactyloid, white ; pa- 

 pillae erect, thickish, simple or rarely divided (K 4- yellowish, then 

 reddish, CaCl — ). Apothecia inclosed in the apices of the papillae, 

 rarely lecanorine, sometimes sublecanorino, blackish, usually covered 

 ■with a thalline operculum ; spores 0,125-220 mm. lonj?, 0,0fj5- 

 85 mm. thick. — Cromb. Lich. Brit. p. GO ; Leight. Lich. Fl. p. 239, 

 ed. 3, p. 2'30.— Lichen dactyUnus Ach. Prodr. (1798) p. 89. Ucheti 

 oculatus Eng. Bot. t. 1833, also of the older British authors pro 

 parte (vide sub Lecanora ocidata). 



Subsimilar to Lecanora ocidata, but differs in the thicker and usually 

 larger papillae. These are generally constipate and rarely once or twice 

 divided. The reaction with K is not always very distinct {cfr. Nyl. 

 Lapp. Or. p. 141). In the British specimens, which are usually sterile, 

 the apothecia are occasionally sublecanorine. 



Hah. On the bare ground and overspreading decayed mosses in alpine 

 situations. — Dktr. Local and scarce on the summits of a few of the 

 higher Grampians, Scotland. — B. M. : Ben Lawers, Perthshire ; Morrone 

 and Ben-naboord, Braemar, Aberdeenshire. 



3. P. Hutchinsiae Leight. Angio. Lich. (1851) p. 30, t. 11. f. 1.— 

 Thallus effuse, thin, minutely rugoso-unequal, whitish or cream- 

 coloured (K— , CaCl— ). Apothecia lecanoroid, in small or sub- 

 moderate, crowded, difform verrucae ; the ostiola large, browuish- 

 black, caesio-pruinose, depressed, lacerate at the margins : spores 

 0,08-12mm. long, 0,040-55 mm.thick. — Mudd,Man.p.277; Cromb. 

 Lich. Brit. p. 59 ; Leight. Lich. Fl. p. 243, ed. 3, p. 233.— Thelo- 

 trema HutcMnsice Borr. Eng. Bot. Suppl. (1831) t. 2652 ; Turn. & 

 Borr. Lich. Br. p. 178 ; Sm. Eng. Fl. v. p. 162 ; Tayl. in Mack. Fl. 

 Hib. ii. p. 103. 



Externallv somewhat resembles Lecanora verrucosa, with which it 

 agrees in habitat, but the structure of the apothecia is very different. From 

 Ui-ceolaria scrujjosa subsp. bryophila, to which, as observed by Borrer, it is 

 also subsimilar, it is at once distinguished by the reaction with CaCl. 

 Its nearest ally in this genus seems to be P. panyrga (Ach.) Fr. fil. ; 

 but from this it differs among other characters in the thallus not becoming 

 papillate. It is apparently peculiar to Ireland. 



Hah. On the ground incrustins: mosses and heaths in an upland situa- 

 tion. — Distr. Extremely local and scarce in S.W. Ireland. — B. M. : Hills 

 near Bantry, co. Cork. 



4. P. melanochlora Xyl. Flora, 1873, p. 70.^ — Thallus deter- 

 minate, thickish, rugoso-verrucose, subrimose, densel)- papillose, 



greyish- white or greyish-fumose (K (CaCl) "^^j^^ rose-coloured)' 

 papillfe short, thick, cylindrical, simple, sorediate at the apices. 

 Apothecia minute, several (2-5) inclosed in the apices of the papillae ; 

 spores 0,180-250 mm, long, 0,075-100 mm. thick. — Cromb. Gre- 

 villea, xix. p. 59. — Isidium melanochlorum DC. Fl. Fr. ii. (1805) 

 p. 326. 



