360 LICHENACEI. [LECAXORA. 



rather narrow, imbricate. Apothecia small, the thalline margin 

 entire, or at length subcrenate ; spores ellipsoid or oblongo-ellipsoid, 

 often somewhat curved, 2-locular (with K polari-bilocular), 0,010-16 

 mm. long, 0,004-8 mm. thick. Martind. Naturalist, 1887, p. 359. 

 Physcia decipiens Am. Flora, 1866, p. 529, 1875, p. 153, t. v. 

 figs. 2, 3. Placodium decipiens Lcight. Lich. PI. p. 176, ed. 3, 

 p. 162, refers chiefly to the following subspecies. 



Characterized by the central thalline verrucae, the narrower radii, and 

 more especially by the spores, the true structure of which, however, as 

 in many other instances, becomes apparent on the application of K. The 

 typical condition here described, represented by Arnold's Lich. Exa. 

 n. 44-5, may, as suggested by Nylander (Flora, 1883, /. c.), be the original 

 Lichen innrornm of Hoffmann. In the very few British specimens seen, 

 the apothecia are few and not well developed. The spermogones, how- 

 ever, are more frequent with spermatia oblongo-bacilliform, 0,030-35 

 mm. long, 0,0007-9 mm. thick. It is, as noted by Martindale, I. c., a 

 somewhat variable plant, and the specimens (well fertile) issued by 

 Larbalestier (s. n. var. camboricum Larb.) are referable to a state in 

 which the thallus becomes effuse, or nearly so, the peripheral lobes being 

 very irregularly produced. 



Hub. On walls in lowland districts. Dittr. Local in S., "VV., and E. 

 England. B. M. : Shoreham, Kent ; near Cirencester, Gloucestershire ; 

 Milton Church, Cambridgeshire. 



Subsp. 2. L. tegnlaris Nyl. Flora, 1883, p. 106. Thallus some- 

 what small, short, plicato-radiate at the circumference, diffracto- 

 areolate in the centre, naked or suffnsed, vitelline, pale-yellow, or 

 miniate. Apothecia small, concave, then plane, concolorous or sub- 

 concolorous with the thallus, the thalline margin entire ; spores asm ' 

 the type, or occasionally somewhat smaller (0,009-0,011 mm. long, 

 0,0035-45 mm. thick). Cromb. Grevillea, xviii. p. 44. Lichen 

 ter/uhtris Ehrh. Exs. n. 304 (1785). To miniate states are referable 

 pro parte Squamaria miniata 8m. Eng. Fl. ii. p. 195. Placodium 

 murorum y. miniatum Mudd, Man. p. 132 ; Cromb. Lich. Brit, 

 p. 45 ; Leight. Lich. Fl. p. 175, ed. 3, p. 162 (ut sp. propr.). 

 LicJien elegans Eng. Bot. t. 2181 (two left-hand figs.). Brit. Ext.\ 

 Leight. n. 207 ; Mudd, n. 95 ; Larb. Lich. Hb. n. 51. 



A smaller and rather variable plant, distinguished from the type and 

 the preceding subspecies, with both of which it is subcontinent, by the 

 characters given. The thallus is at times somewhat scattered with the peri- 

 pheral radii little distinct. It is always well fertile, the apothecia being 

 numerous and varying in colour like the thallus. The spermogones have 

 the spermatia either as in the type or a little smaller (0,002-3 mm. long, 

 0,0007-8 mm. thick). It is to vermilion-coloured states that the trivial 

 name miniata (Hoffm.) has more especially been applied ; but as other 

 species growing in dry and exposed habitats, especially calcareous, have 

 similarly coloured thalli, the name cannot with propriety be used either 

 in a specific or varietal sense. 



Hob. On rocks and walls, very rarely on old timber, from maritime to 

 upland situations. Distr. Here and there throughout Great Britain; 

 rave in the Channel Islands; nut seen from Ireland. B. M. : Kozel, 



