128 



LECANOKA ANGULOSA, (Schreb.) Ach. 



This lichen has lain hid amid L. suhfusca and L. alhella, but may 

 be distinguished by the epithecium of the apothecia becoming of 

 an opaque yellow with hydrate of potash, precisely similar to the 

 reaction of L. glaucoma. This peculiar reaction in L. angulosa 

 was pointed out by Dr. Nylander in his Lich. Pyren. Or. in the 

 " Flora." It must, therefore, be separated from L. suhfnsca and 

 alhella, and rank as a distinct species in the section with L. glau- 

 coma. Two varieties of it have been made by Acharius and others, 

 distinguished by the apothecia being distinctly margined, or with 

 the margin obliterated and the apothecia becoming convex or even 

 hemispherical. But the original describer of the lichen (Schreber) 

 in his " Spicilegium," p. 136, evidently incli;des both varieties as 

 only states, and, indeed, the transition may be readily traced on 

 many specimens. Mr. Roper sent me (Nov., 1874) a specimen 

 gathered by him at Eastbourne, for determination, which proved on 

 testing to be L. angulosa. This set me to an examination of my 

 herbarium, and I discovered that I possessed specimens from Nor- 

 way, Sweden, Lombardy, Eastern Pyrenees, Italy, and Tasmania. 

 In " Exsiccata" it is represented by Sommerf. Crypt. Norv., 64; 

 Anzi Langol., 103 ; Anzi Ital. Sup., 178 (left hand specimen) 

 and 179; Coemans, 322; Mudd. 114 and 115; Nyl. Pyren. 

 Orient., 19 ; Borrer's Herb, at Kew has it from Sussex and United 

 States of America, but, with these exceptions, it is absent from the 

 " Hook. Herb." I gathered it in 1850 at Loppington, Shropshire, 

 and in 1873 at Nesscliffe Hill, Shropshire. Mr. W. Pliillips col- 

 lected it in 1875 at Westbury, in Shropshire. No doubt it will now 

 be detected generally throughout England. — W. A. Leighton. 



NOTE UPON THE RIMULARIA LIMBORINA, Nyl. 



M. Leighton supposes, relying upon the authority of M. Th. 

 Fries, that this lichen is only the Lecidea troches, Tayl., and that 

 the Lecidea inconcinna, Nyl., also belongs to the same species; 

 Having at hand the specimens upon which these two species and 

 the genus Rimularia itself have been established by M. le Dr. 

 Nylander, in the interest of triUh I feel called \\\)o\\ to interfere, 

 as M. Leighton contends with an opinion which I believe to be 

 quite erroneous. Thus, as two cryptogamists, also versed in the 

 study of the lichens, having committed this error, it must be ad- 

 mitted that the sjiecimens submitted to their examination were not 

 authentic, nor like mine, as I concluded immediately on the first 

 look at the figure of a cut of the apothecia of Rimularia limhorina 

 given by M. Leighton; because in this genus the thalamium is 

 completely enclosed in a conceptacle, the superior part of which is 



