554 f . BET. J. M. CEOMBIE ON THE LICHENS OP 



himself according to the order of the Plates and figures in * Hist. 



Muse./ the printed labels attached to most of the specimens 



having been extracted apparently from the proof-sheets of his 



work. Unfortunately in several instances there are no specimens 



present of the species described and figured by him, their places 



being supplied simply by the corresponding figures. Most of these, 



however, can be satisfactorily identified from other sources, 



e. g. herbaria of Sherrard and Buddie, to both of which he had 



access, and which he duly consulted. In what follows I have 



given the nomenclature, as well as references to the Tables, of 



1 Hist. Muse.,' which will obviate the necessity of lichenists having 



to turn to the text, as well as to the figures of Dillenius, which 



are not always readily accessible except in scientific libraries. 



Genus TV. TJsnea. 

 Tab. XI., Dill. Hist. Muse. 



F. 1. TTsnea vulgaris, lorislongis implexis, p. 56, = TTstfEACERA- 

 tina, Ach. Fertile. The specimen figured is sufficiently charac- 

 teristic, though in hb. Dill, it is broken up into three portions. 

 By Linnaeus and other authors this has been referred to TTsnea 

 plicata. 



F. 2. TTsnea loris longis dichotomis, extremitatibus tenuioribus, 

 p. 59. Of this there is no specimen, the figure being copied from 

 Michaeli. As conjectured by Acharius, L. TJ. p. 595, it probably 

 represents an old (atypical) state of Alectoria sarrnentosa, Ach. 



P. 3. TTsnea loris longis dichotomis, extremitatibus crassioribus, 



p. 60. The figure 1 



no specimen in hb. Dill., where its place seems to be occupied by 



another species, viz. 



TTsnea albo-punctata, Nyl. in MSS. "Subsimilis Z7. plicatce, 

 sed thallo tereti lsevi punctis albis subprominulis punctato, efi- 



Apothecia non visa." (Aj/Z. in lift.) This species has 



Michael 



brilloso. 



(Brodie) 



F. 4. TTsnea capillacea et nodosa, p. 60, = Usnea arttculata 

 (Z.). The specimen, though sterile, is sufficiently typical. 



Tab. XII., Dill. Hist. Muse. 



F. 5. TTsnea mollis, ramis longis compressis, p. 62,=Evebnia 

 ditaeicata, Ach. The specimen figured is represented in hb. 

 Dill, by only two or three sterile lacinise. 



