LECANORA. ] LECANO-LECIDEEI. 357 
Subgen. 4. PLACODIUM Nyl. Not. Sallsk. pro F. et Fl F. 
Forh, v. (1866) p. 126.—Thallus radiating, usually effigurate at the 
circumference. Apothecia often at length subbiatorine ; spores Sune, 
ellipsoid, polari-bilocular, usually with longitudinal tube, very 
rarely simple or subsimple; hymenial gelatine (especially the 
theese) bluish with iodine. Spermogones with shortly jointed 
sterigmata, and straight, oblong or bacilliform spermatia.— Placo- 
ee Fl. Fr. ii. (1805) p. 377; Nyl. Mém. Soc. Cherb. iii. 
p- : 
O : 
Ones fe) 
ithog tanec OO tir ett 
PhO gto get aty siya, ta o? 
loo og Op ogags Gat og 0° 
wD aephog dar Ogdga sgt dg ooh 
Gee Oop dnod Og ggdy 2a 00g i) 
Wage 90008) gq 50460005 09% 
OY 0,00009; 0,00 04g 00, 0% 
Fig. 61. 
Lecanora (Placodium) callopisma Ach.—-a. Vertical section of thallus, x 200. 
6, Three spores, x 500. c. Sterigmata and spermatia, x 500. 
Known by the more or less radiose thallus (which is variously yellow, 
very rarely whitish), by the usual mode of division of the spores, and by 
the short arthrosterigmata. The spermogones are externally somewhat 
prominent, with the ostioles in the yellow thalli orange-yellow. 
9. L. fulgens Ach. Lich. Univ. (1810) p. 437; Nyl. ew Hue, 
Revue Bot. 1886, p. 21.—Thallus orbicular, submonophyllous, 
adnate, opaque, laciniato-divided at the circumference, pale yellow 
or citrine ; laciniz crenate or crenato-lobulate (K+ reddish-purplish). 
Apothecia small, plane or convex, orange-coloured, K + purplish, the 
thalline margin concolorous, at length obliterated; spores simple, 
0,009-12 mm. long, 0,005-6 mm. thick.—Placodium fulgens Gray, 
Nat. Arr. i. p. 447; Mudd, Man. p. 131; Cromb. Lich. Brit. p. 45; 
Leight. Lich. Fl. p. 178, ed. 3, p.164. Squamaria fulgens Sm. Eng. 
Fl. v. p. 195. Lichen fulgens Sw. N. Act. Upsal. iv. (1794) p. 246 ; 
Eng. Bot. t. 1667 ; Dicks. Crypt. fase. iv. p. 24.—Brit. Ews.: Larb. 
Cesar. n. 27; Lich. Hb. n. 296; Cromb. n. 155. 
From the simple spores this might be referred, as has often been done, 
to subgenus Syuamaria. Its true place, however, is shown by the 
