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XVI. New Irish Lichens. By the Rev. М.А. LEIGHTON, B.A.Camb., 
F.L.S., F. B.S.Ed., $c. 
(Plate XXXIII.) 
Read April 5th, 1877. 
PERTUSARIA INCARNATA, Leight. Thallus creamy-white, thin, tartareous, effuse, 
smooth, plane, minutely rimuloso-diffract. (К — О —.) Apothecia single, of a waxy 
appearance, paler than the thallus, prominent, sessile, depresso-globose, variable in 
size according to age, in maturity large; ostiolum yellowish flesh-colour, lecanoroid, 
at first small and round, poriform, eventually dilated and urceolate, surrounded by 
a broad, thick, pale, waxy, (Ла іше margin ; hymenium in section ceraceo-gelatinose, 
flesh-coloured; paraphyses slender, more or less branched and entangled, apices 
colourless; spores 2, colourless, very large, lineari-oblong or ellipsoid, simple, with 
a very narrow limb or epispore. 
On granite rocks, very rare, Kylemore, co. Galway, Ireland, Mr. Larbalestier 
(1875). 
Spores 062—067 mm. long, ‘083—085 mm. broad. Gelatina hymenea I violet. 
This beautiful lichen is excessively rare, and apparently quite new to science. It has 
occurred only once to Mr. Larbalestier, whose indefatigable and skilful lichenological 
researches in the west of Ireland have added so many and such rare novelties to our lichen- 
flora. In general external aspect it a good deal resembles Lecanora epulotica, Ach., for 
which it might cursorily be readily mistaken; but the number, size, and shape of the 
spores and other characters keep them abundantly apart. It seems allied to Pertusaria 
rhodoleuca, Th. Fries; but that species is at once distinguished by its 8 smaller spores. 
^ Pertusaria rhodocarpa of Garovaglio’s ‘Comment. de Pertusariis Europ. Med.’ p. 8, t. iv. 
f. 4, is like it in the large size and narrowly limbed two spores, but differs in growing on 
mosses, and having a verrucoso-granulose thallus and coacervate aggregate numerous 
apothecia. Garovaglio’s plant, which he refers doubtfully to P. rhodocarpa, Krbr. 
(Syst. р. 384), cannot be identical with that German lichen, inasmuch as Th. Fries, who 
has examined an original specimen from Körber, ‘in Lich. Scand.’ p. 322, refers Kórber's 
lichen to Varicellaria rhodocarpa, Th. Fr., which has an immense single 1-septate spore, 
and is represented in Th. Fr. L. Scand. Exs. 73! and has reaction K—, C crimson, and is 
altogether different in its sorediate thallus. 
ШЕСІрЕА РОГОЗРОВА, Leight. Thallus white or albo-glaucous, very thin and filmy, 
effuse, smooth, and somewhat shining, unequal or rugulose (K— C—); apothecia 
black, minute, scattered, adnate, plane, with a narrow slightly prominent margin, 
at length plano-convex and immarginate; hypothecium nigro-fuscous; hymenium 
