200 Rev. W. A. Leiglitou on the Lichens of CaJer Idria. 



Corwen, Rev. T. Salwey," and as ^^ Lecidea compressa,M.SB., 

 Carig Mountain, co. Kerry, Dr. Taylor." I have myself 

 gathered it at Llyn Aran, Cader Idris ; Cwm Glas, Snowdon ; 

 and Abdon Burf, Shropshire ; and possess it from '^ Smolandia, 

 Femsjo, Dr. Th. M. Fries." Dr. Nylander, in Ittt., says of 

 it: — "Z. payiceola^ Ach., est caracterise par ses cephalodies 

 (' granulis tuberculosis lilacino-rufescentibus '). C'est la seule 

 esp^ce parmi les Lecid^es (et Lecanora) qui poss^de des cepha- 

 lodies, et elles sont constantes." 



Of L. jyhceops^ ^l^-i ^i'* Carroll, in Seem. Journ. Bot. 5. 

 255, says, " = Lecanora rhcetica^ Hepp, var. hyjperhorea^ Nyl. 

 (oliin).^^ Dr. Nylander's description of phceops^ in his Lich. 

 Scand. 196, is excellent and characteristic. Its chemical re- 

 action is K yellow, C yellow. The Herb. Borrer. has it from 

 Dr. Taylor, " on wet rocks near Dunkerron," and " on Cap- 

 pamore Hill, co. Kerry," but labelled ''''Lecanora cyrtaspis, 

 Ach. L. U. p. 397?," as Mr. Borrer justly remarks, "in- 

 correctly." 



True Lecanora rA«</ca, Hepp, will be found in Am. Exs. 117 

 and Anzi, Lich. Langob. 151, it has no chemical reaction 

 (K— C — ), and is well described in Anzi's Catal. p. 82, as 

 L. nivalis^ Anzi. 



Ljccidea co«sew^i*ews,Nyl.,has no chemical reaction (K — C — ), 

 and has the appearance of some states of Lecanora cinerea(L.), 

 with the white smoothish rimuloso-diffract thallus of phceops^ 

 Nyl., from which, however, it differs by the plane, innato- 

 impressed, obtusely margined, black apothecia, with thin 

 blackish hypothecium, and spores ellipsoid, as large as those 

 of Lj. panoeola^ Ach. It must be remarked that my Llyn-Cae 

 specimens of consentiens have most certainly pale cephalodia j 

 and if p)C''^^<^ola really be the only species which possesses 

 cephalodia, as Dr. Nylander asserts, then our consentiens would 

 seem referable as a state of that species, were it not for the 

 different chemical reaction (K yellow, C red), as well as other 

 characters. 



In his Syn. Lich., Dr. Nylander considers Stereocaulon ce- 

 reolinum^ Ach., a minor form only of S. condensatum^ Hffm. ; 

 and as he has had full opportunities of examining the Acharian 

 Herbarium, no doubt he is correct. He cites, as a figure of 

 this, E. Bot. Suppl. 2667. The Rev. Thomas Salwey, who 

 first detected Stereocaidon cereolus, E. B. S. 2667, on Cader 

 Idris, in his list of Welsh Lichens gives as particular locali- 

 ties for it, " about Llyn Gwernon," and " at foot of Cader 

 Idris;" and the lichen which I have found in those places is a 

 variety of S. condensafum. The herb. Borrer. at Kew con- 

 tains similar specimens " from Llyn Gwernon," and from 



