—94— 



Lecidea obscurata forma ferrata Nyl. Scand. p. 234. (1861.) 



Like the species in all except color. The thallus is rusty-red, and the apo- 

 thecia are likewise suffused. 



On submerged rocks in a stream, and rarely about its borders, Camden. 



Apothecia concentrically disposed. The plant when wet is of a brighter 

 color than in its dried state, and is a rarely pretty object. Unreported from 

 America. 



Lecidea {Rhizocarpon) amphibia Fr. Vet. Ak. Handl. 1822. p. 262. 



Thallus verrucose-areolate, the areolae contiguous, bluish-cinereous K — , C — 

 hypothallus obsolete. Apothecia at first immersed, but becoming emergent, 

 small or medium, disk black, plane or more commonly convex with a thin per- 

 sistent margin. Spores various in number, oblong or oblong-ellipsoid, from 

 rarely three-septate commonly muriform, colorless or fuscescent, more or less 

 halonate, 26-36 x 13-16 ix, hypothecium brownish or nigrescent, paraphyses 

 confused, tips variously yellowish or violet, hymenial gel. with I -f intense blue. 



On schistose rocks, summit of Ragged Mt., alt. 1400 ft., Rockport. In 

 our plant the apothecia are concentrically disposed. The specimen was not 

 found near a stream or lake, such being the habitat given for the species in 

 Europe, but on a bare ledge having a southern exposure. Curiously L. obscur- 

 ata, not particularly a water-loving plant, is here noted as inhabiting brooks, 

 while the oresent, given a name for its predilection for a moist home, is found 

 where the only moisture is derived from rains and fogs. The determination is 

 certain, however. In our specimens the spores are muriform, colorless, and in 

 four's. No record is found for the United States. 

 Lecidea (Rhizocarpon) lavata (Ach.) Nyl. Flora. 1873. p. 13. 



Thallus thin, continuous and rimulose or somewhat diffract-areolate fusco- 

 cinereous, K — , C — . Apothecia d pressed, typically innate, circumcised, con- 

 cave, with an elevated and persistent margin, or the disk plane and margin sub- 

 evanescent, black. Spores 8, oblong-ellipsoid, muriform, colorless, faintly 

 halonate, 33-35 x 11-15 m. hypothecium brownish or fuscescent, paraphyses 

 distinct but gelatinous. 



On granite and quartz rock. So. Thomaston. 



The species is also identified in material from Vancouver Island collected 

 by Mr. J. Macoun. 



Lecidea (Rhizocarpon) alpicola (Wahl., Schaer.) Nyl. in Act. Soc. Linn. 

 Bord. ser. 3, L, p. 388- 1856. 

 On granite, Ragged Mt., Rockport, alt. 1,100 ft. 



This species is wholly inseparable from L. geographica except by its spores, 

 and the Sporologists notwithstanding, belongs in the same section of Lecidea. 

 It is unknown in the United States except from a Nevada station, and from the 

 higher summits of the White Mountains of New Hampshire. Tuckerman states 

 that the thallus is coarser than is that of L. geographica, and that the apothecia 

 are detruded. Our plant is certainly coarser than the L. geographica of our 

 region, but curiously less coarse than many examples of L. geographica collected 

 on the summit of Mt. Washington, and the fruit is not markedly detruded. 



Rockland, Maine. 



