—79— 



Reported from Labrador, Newfoundland, Greenland and Alaska under 

 various synonyms. 



There is little to distinguish the variety from the species, the more obvious 

 characters of separation consisting of constantly three-septate spores, larger 

 and darker apothecia and their greater abundance. 



Lecidea prasinula (Wedd.) B. de Lesd. in Not. Lichenolog. No. VIII, Bull. 

 Soc. Bot. Fr. p. 421. (1908.) 



Lecidea parasema var. prasinula Wedd. Lich. "des laves I'Agde," p. 19. 



Thallus effuse, irregular in outline and extensively spreading, granulose or 

 granulose-areolate, sordid-yellowish or greenish, K + reddish-orange. Apothecia 

 small, impressed, black, with a slightly elevated margin. Spores 8, ellipsoid, 

 simple, 10-14 X 8-9 IX, hymenium colorless, hypothecium brown, tips of the para- 

 physes greenish. 



On shaded rocks, walls and ledges, Rockland, Rockport, and So. Thomaston. 

 Often found but not common. New to America. 



Lecidea prasinula forma major B. de Lesd. in Not. Lichenolog. No. XIV. 

 Bull. Soc. Bot. Fr. p. 660. (191 1.) 



Thallus thicker than in the species, but similarly granulose-areolate and 

 sometimes diffract, yellowish or greenish and somewhat sorediose, reaction as 

 in the species. Apothecia relatively large, plane or convex, with a more or less 

 flexuous border. Spores 8, ovoid-ellipsoid, simple, 11-15 x 6.5-9 the other 

 internal characters as in the species. 



On granite. So. Thomaston. 



The apothecia are very similar to those of L. plaiycarpa, and the affinities 

 of both species and form are with that species. New to America. 



Description from the co-type in my herbarium. 

 Lecidea sorediza Nyl. in Bull. Soc. Linn. Norm. ser. 2. 6: 292. (1872.) 



Thallus determinate, ashy-greenish, smooth, rimulose, besprinkled with 

 rounded, scattered or crowded, flavescent soredia, K +, I + bluish in our speci- 

 mens. Apothecia medium or large, scattered, at first plane, then convex, some- 

 times umbonate or proliferous, rounded or flexuous, the margin slightly elevated 

 or excluded, disk black, often faintly pruinose. Spores 8, ovoid or ellipsoid, 

 simple, 15-22 x 7-9 [x, hypothecium thick and black, paraphyses distinct, co- 

 herent, tips dark, whole hymenium with I -f bluish. 



On mica-schist in shaded places, Mt. Megunticook, Camden. 



Very near L. contigua but sufficiently different to be a marked plant. Crom- 

 bie gives the reaction as K— , C — ■. The hypothallus black and conspicuous. 



Reported from Newfoundland in Macoun's list of Canadian Lichens, but 

 unrecorded from the United States. 



[Concluded in November ?iumber] 



