^^^ LICHEXACEI. [lEC.V^'ORA . 



rather narrow, imbricate. Apothecia small, the thalliiie margin 

 entire, or at k^ngth subcreuate ; spores ellipsoid or oblongo-ellipsoid, 

 often somewhat curved, 2-locular (-nith K poluri-bilocular), 0,010-1(> 

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

 — Phi/scia decipiens Arn. Flora, 18(36, p. 529, 1875, p. 153, t. v, 

 figs. 2, 3. — Placodium decipiens Leight. Lich. Fl. p. 176, ed. 3, 

 p. 162, refers chiefly to the following subspecies. 



Characterized hv the central thalline verrucse, the naiTower radii, and 

 more especially by the spore?, the true structure of which, however, as 

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

 tvpical condition here described, represented by Arnold's Lich. Exs. 

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

 Lichen nnirorum of Hoflinann. In the very few British specimens seen, 

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

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

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

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

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

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

 very irregularly produced. 



Hah. On walls in lowland districts. — Diatr. Local in S., W., and E. 



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

 Milton Church, Cambridgeshire. 



Subsp. 2. L. tegularis Xyl. Flora, 1883, p. 106.— Thallus some- 

 "what small, short, plicato-radiate at the circumfereuce, diffracto- 

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

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

 concolorous with the thallus, the thalline margin entire ; spores as iu 

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

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

 tif/ularis Ehrh. Ess. n. 304 (1785). To miniate states are referable 

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

 murorum y. miniciium Mitdd, Man. p. 132 ; Cromb. Lich. Brit, 

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

 Lichen elegans Eng. liot. t. 2181 (two left-hand figs.). — Brit. Ex9.: 

 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, witli both of which it is subconlluent, by the 

 cliaracters 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 

 tlie spermatia either as in the t\'pe or a little smaller (0,002-3 umi. long, 

 0,0(X)7-8 mm. thick). It is to vermilion-c-oloured states that the trivial 

 name miniata (Iloil'm.) has more especially been applied ; but as other 

 .species growing in dry and exposed habitats, especially calcareous, liave 

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

 in a specific or varietal sense. 



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

 upland situations. — Uistr. Here and there throughout (urat Jhitain; 

 rare iu the Channel Islands ; nut seen from Ireluud.— B. M. : Jiozel, 



