LICHENS OF THE ISLE OF MAN. 
275 
L. obseurata (Ach.). White or grey, divided into roundish divisions, 
flat, with a black line round the edge ; apothecia black, with broad 
brown border. Spores 8, colourless or pale brown, built up of 
globules, '02 x '012 mm. ; hypothecium dark brown ; paraphyses 
distinct; apices dark brown. On subalpine rocks, Ballure Glen, 
Ramsey. 
L. strepsodina (Ach.). Dirty grey, thin; apothecia black, border black, 
wavy. Spores numerous, minute. Rare. On mortar in wall, Ramsey. 
Lithographa dendrographa (Nyl.). Thallus grey, soon disappearing; 
apothecia black, in dense clusters, linear, oval or sinuous. Spores 
numerous, colourless, minute, simple ; paraphyses branched ? Rare. 
On trees, Ramsey. 
OpegTapha atra (Pers.). Grey, shining, thin; lirellse 
(apothecia) black, crowded, linear, lying in all 
directions. Spores 8, colourless, 3-septate, pointed, 
minute. On trees, Ramsey. 
012 x 004 mm. 
0. amphotera (Nyl.). Greenish grey, thin, smooth ; lirellse black, 
numerous and crowded, looking something like Chinese writing. 
Spores 8, colourless, long and narrow, 6-9-septate ; paraphyses few ; 
slender ; spermatia cylindrical, curved. Rare. On fir trees, Ramsey. 
Section of Lirella, 
Ascus and 
Spores. 
•05 mm. 
Spores 03 mm. 
0. herpetiea, form rubella (Pers.) Brown olive, thin, 
smooth, finely granular; lirellse black, small, 
prominent, simple, oval or elongated. Spores 8, 
brown, 3-septate, tapering at one or both ends. 
On trees, Ramsey. 
Spermatia. 
•01mm. 
0- herpetiea, form vera (Leight.). Grey olive, scattered over with 
spermogones, like black points ; lirellse black, single or clustered, 
straight or curved, imbedded in thallus. Spores 8, colourless, 
tapering, 3-septate. On trees (amongst Leoanora sub-fusca, form 
rugosa), Ramsey. 
December, 1893. 
