p. 90 (1870), ScMsmatomma amylaceum var. candidum Mudd
Man. p. 222, t. 4, f. 84 (1861).
Exsicc. Mudd n. 199 ; Leight. n. 336 (as Lecidea amylacea).
As noted above, the Lichen candidus of Engl. Bot. was quoted at
p. 137 on Leighton’s authority as the original of his Lecidea Turneri.
Though no spores are to be found in the British Museum specimen, it
seems more probable th a t it belongs here. Leighton had already
quoted it as synonj’inous with his published specimen, Lecidea
amylacea n. 336.
Hah. On maritime and subalpine rocks.—Bistr. Eather rare in E.
and N. England and the Grampians, Scotland.—B. M. Ingleby Park,
Cleveland, Yorkshire ; Staveley, Westmoreland ; the Trossachs, Perthshire
; Achallater, Braemar, Aberdeenshire.
5. L. delimis A. L. Sm.—Thallus dark-greyish, warted-
granular or wrinkled, scattered (K + yellow, CaCl + red) ;
hypothallns dark brown limiting the thallus. Apothecia small,
black, convex, thinly marginate or immarginate, greyish-pruinose ;
hypothecium thick, black ; paraphyses subdiscrete ; epithecium
granular, dark in thick section ; spores linear-oblong or somewhat
fusiform, 3-septate, slightly constricted a t the septa, 0,015-
18 mm. long, 0,004-5 mm. thick or longer and narrower, 0,021-
23 mm. long, 0,003 mm. thick ; hymenial gelatine tawny-wine-
coloured or reddish with iodine.—Lecidea delimis Nyl. in Flora
Ivi. p. 297 (1873) ; Cromb. in Journ. Bot. xii. p. 149 (1874):
Leight. Lich. FI. ed. 3, p. 351.
Hah. On rocks.—B. M. Mount Orgueil, Jersey (the only locality).
82. PLATYGRAPHA Nyl. in Mém. Soc. Sci. Nat. Cherb.
iii. p. 188 (1855). (PI. 19.)
Thallus scanty or evanescent. Apothecia roundish or oblong,
simple or rarely divided, immarginate, b u t with a spurious
thalline margin, blackish ; spores 8 in the ascus, fusiform,
septate, colourless ; paraphyses slender, more or less discrete.
Spermogones with shortly cylindrical straight or slightly arcuate
spermatia.
The genus is almost entirely exotic, but of the four known
European species, two occur very sparingly in Great Britain.
1. P. periclea Nyl. I. c. & in Act. Soc. Linn. Bord. sér. 3,
i. p. 408 (1856).—Thallus effuse, scanty, very thin, subleprose,
white or whitish. Apothecia depressed, rotundate or oblong,
a t times somewhat difform, black, opaque, concolorous within,
the thalline margin a t length subevanescent ; spores narrowly
fusiform, 3-septate, often curved, 0,030-0,042 mm. long, 0,003-4
mm. thick ; hymenial gelatine bluish then wine-red with iodine.—
Martind. in Naturalist, 1886, p. 49. Lichen pericleus Ach. Lich.
Suec. Prodr. p. 78 (1798).
Like other species of the genus, this might in some states readily
be taken for a Lecanora, allied to L. exigua, to which species
Acharius subsequently referred it (Lich. Univ. p. 355) : the name
foT 'S t r 4° several D i a r t i. p. d9o). The spermogones have beeBn ridtiesshc riabuetdh oarss
Pyrenothea stieUea Fr. in Vet. Ak. Handl. 1821, p. 334.
Bah. On the trunks of old oaks and firs in upland tracts of
mountainous districts.—HisZr. Only very sparingly in N.W. England
f c i b t ^ r t the N. Grampians, Scotland; no
doubt to be detected elsewhere.—A. M. Near Old Mar Lodge
Braemar, Aberdeenshire. -uoage,
2. P. rimata Nyl. ll. C.-Thallus effuse, thin, warted and
cracked, whitish Aj^thecia impressed in the verrucæ, simple or
d iv i jd variously difform, plane or slightly convex, unequal,
blackish, somewhat shining, with a narrow spurious thamne
te s iw u ^TPothecium thick, brownish-black ; spores narrowly
r ? ^0no'®!4’4a4e, more or less curved, 0,024-34 mm. lon<r
about 0,003-4 mm. th ic k ; hymenial gelatine bluish then wiim!
reddish with iodine.—Mudd Man. p. 244, t. 4 f. 95 • OromK
Lich. Brit. P- 101; Leight. Lich. FI. p. 388;’ ed. 3,’ p. 411'
f Plot. Lich. Exs. n. 438b
(1829) hde Nyl. m Act. Soc. Linn. Bord. I. c. Ghiodecton
ri» t”v LsTi'Sij"
lire apothecia, which are usually one in each verruca, are rather
""*4 form being sometimes linear and s h g S y
branched. In the very few British specimens seen the sp e rin o g le s
long present, have the spermatia somewhat arcuate, 0,004-5 mm!
M t s
C h ï f c t à S k t D S S Î Hill, S h ro p ,h » ;
ARTHONIACEkSl.
/h T4iallus crustaceous, thin, often developed under the bark
(hypophloeoda , evanescent or wanting. Apothecia roundish or
difform (ardeZ/as) or elongate {lirellse); ascus short, pyriformbran
h ] fl I or muriform ; paraphyses
branched confluent; spermogones with simple sterigmata and
ovate, cylindrical or slender spermatia.
The _ order is throughout distinguished by the immarrinate
b r S r ' s h o t' f I'esemble a small spot or stain on the bark, and
g L e r a - - ? Py'^ilorm asci. I t is represented in Britain by two
Spores 1- or p lu ri-s ep ta te ............... 83. Arthonia.
Spores septate and muriform ....... 84. Arthothelium.