66 FUNGUS-FLORA. 



reddish, then reddish black, 1-2 mm. broad ; asci cylindrical, 

 apex narrowed ; spores 8, quite irregularly biseriate, oblong, 

 ends obtuse, straight or very slightly curved, 2-4-8-Cblled, 

 sometimes becoming muriform, often guttulate, 2030 X 

 10-14 ju., hyaline then yellowish ; paraphyses filiform, about 

 2 p. thick, branched above, flexuous. 



Lecanora datina, Acharius, Lich. Univ., p. 387 ; Leighton, 

 Brit. Lichen Flora, p. 223. 



On bark of fir, holly, &c. 



Distinguished from P. pinicola by the reddish disc, and 

 more distinctly by the sporidia having very obtuse ends. 



Specimen determined by Nylander examined. 



OSTEOPA. Fries. 



Ascophore vertically immersed in the bark, rarely pene- 

 trating the wood, broadly ovate, terminating upwards in a 

 somewhat prominent papilla that bursts through the bark 

 and dehisces by an elongated slit, lips thick and obtuse ; 

 asci narrowly cylindrical, 8-spored, apex thickened; spores 

 needle-shaped, multi-septate, colourless, almost as long as the 

 ascus, arranged in a parallel fascicle; paraphyses very 

 slender, straight, septate, branched above, colourless. 



Ostropa, Fries, Syst. Veg. Orb., p. 109; Kehm, Krypt.- 

 Flora, Disc., p. 189 ; Sacc., Syll., ii. p. 804. 



Allied to Eobergea, but distinguished by the vertical 

 ascophore and the ostiolum being elongated. 



Ostropa cinerea. Fries, Summa Veg. Scand., p. 401 ; 

 Eehm, Krypt.-Flora, Disc., p. 188, figs. 1-5, p. 186; Sacc., 

 Syll., ii. n. 4661. 



Scattered or gregarious, causing the branch to present a 

 whitish bleached appearance at the parts attacked ; ascophore 

 subglobose, base immersed, 1-2 mm. across, furnished at the 

 apex with a papilla that projects through the bark and 

 dehisces at the apex by a narrow slit about f mm. long, 

 mouth at first hoary, grey, then naked, black, and somewhat 

 shining; asci narrowly cylindrical, straight, 8-spored, apex 

 thickened ; spores almost as long as the ascus, straight, 

 arranged in a parallel fascicle, very slenderly needle-shaped, 



