VARICELLARIA. | LECANO-LECIDEFI, 511 
63. VARICELLARIA Nyl. Mém. 
Soc. Cherb. t. v. (1857) p. 117; Lich. 
Scand. p. 182.—Thallus thinly crusta- 
ceous, pulveraceous or subleprarioid. 
Apothecia variolarioid or sorediiform 
(in convex verruce), pale, carneo- 
punctate or suffused; thece ventri- 
cose, Monospored ; spores very large, 
l-septate, colourless; paraphyses 
scanty, subdiscrete, slender, variously 
arcuate. Spermogones not yet seen. 
Among other characters well distin- 
guished from Pertusaria by the septate 
spores, which are also the largest observed 
among lichens. Only a single species is 
known, which has recently been recorded 
as British. 
1. V. microsticta Nyl. Mém. Soc. 
Cherb. t. v. (1857) p. 117; Lich. 
Scand. p. 183, t. i. f 8.—Thallus 
effuse or subdeterminate, unequal, 
rimose or granulato-pulverulent, sub- 
leprose, whitish (K—,CaCl—). Apo- 
thecia moderate, prominent, rotundate, 
above plane or unequal, often 2-3 2S BO 
confluent, white-suffused or denudate, Fig. 71. 
concolorous within; spores ellipsoid ’ericellaria microsticta Nyl.— 
or ovoid, 0,225-0,350 mm. long, A spore, x 350. 
0,095-0,115 mm. thick; hymenial gelatine and the thecw deep 
blue (then often denigrate) with iodine.—Cromb. Journ. Bot. 1882, 
p. 274.—According to Th. M. Fries (Lich. Scand. p. 322) it is 
Pertusaria rhodocarpa Koerb. Syst. Lich. Germ. p. 384, “ sec. spec. 
orig.”; but as Koerber’s diagnosis by no means corresponds, the 
specific name of Nylander must be adopted. 
When sterile and less developed the plant looks quite like a leprarioid 
or variolarioid state of some Pertusarta, The apothecia are innate in the 
thalline glomerules, subolobose or at length depressed; in the two 
British specimens they are only sparingly present in a rightly developed 
condition. 
Hab. On the ground in an alpine situation.—Distr. Extremely local 
and scarce on one of the N. Grampians, Scotland ; though it probably 
also occurs corticolous in the same district.—B.M. : Ben Avon, 
Braemar, Aberdeenshire. 
Subtribe IV. THELOTREMET Ny). Lich. Scand. (1861) p. 183, 
emend. apud Stiz. St. Gall. Nat. Ges, 1880, p. 394. 
Thallus crustaceous, continuous, areolate or pulverulent, in- 
ternally containing gonidia. Apothecia urceolato-impressed, often 
with double margin; spores variable in number, plurilocular 
