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POPULAR HISTORY OF LICHENS. 



woven, softish. Apothecium black, — at first immersed in 

 fusiform or ovoid, sub-apical swellings of the thalline fila- 

 ments, and resembling in structure the apothecium of Li- 

 china. (E. B. 2318.) 



Not uncommon on alpine rocks on many of our High- 

 land mountains, growing frequently along with varieties 

 tristis and lanata of Parmelia Fahlunensis, with which it 

 was classed by older writers in the genus Cornicularia. It 

 is often found in small cavities in the rock which are occa- 

 sionally filled with rain-water. The synonymy of this spe- 

 cies has varied much, and it has long sought a resting-place 

 in classification. Several authors have claimed it as an Alga; 

 while according to others it has been by turns the Lichen 

 puhescens, Cornicularia pubescens, Ephebe pubescens, and Col- 

 lema puhescens. The thecse are clavate ; the spores elliptic, 

 hyaline, and bilocular. The latter resemble, in their deve- 

 lopment, the spores of the genus Lichina. Its spermogones 

 are to be looked for in minute spheroidal swellings towards 

 the apex of the thalline filaments. The sterigmata are mi- 

 nute, simple, linear, and closely aggregated ; the spermatia 

 acrogenous, oblong, with truncate extremities. Bornet de- 

 scribes spermogones as occurring on one plant, and apo- 

 thecia on another ; if this be uniformly the case, it must be 



