200 Kev. W. A. Leighton on the Lichens of Gader Idris. 



Cor wen, Rev. T. Salwey," and as '■'■ Lecidea covipressa,M.^i^., 

 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 litt., says of 

 it: — "X. ^anceola, Ach., est caract^ris^ par ses c^phalodies 

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

 esp^ce parmi les Lecidees (et Lecanora) qui poss^de des cdpha- 

 lodies, et elles sont constantes." 



Of L. phceojysj ^J^-i ^^' Carroll, in Seem. Journ. Bot. 5. 

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

 (olim).^^ 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 cyrtaspisj 

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

 correctly." 



True Lecanora rAoei/ca, Hepp, will be found in Arn. 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 J Anzi. 



Lecidea co;25ew^«ews,Nyl.,has no chemical reaction (K— C — ), 

 and has the appearance of some states of Lecanora cinerea{Ij.)j 

 with the white smoothish rimuloso-difiract thallus of p)hoeops^ 

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

 imj^ressed, obtusely margined, black apothecia, with thin 

 blackish hypothecium, and spores ellipsoid, as large as those 

 of L. panaiola^ Ach. It must be remarked that my Llyn-Cae 

 specimens of consentiens have most certainly pale cephalodia ; 

 and if panceola 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- 

 reolinumj Ach., a minor form only of S. condensatum, Hffm. j 

 and as he has had full opportunities of examining the Acharian 

 Herbarium, no doubt he is correct. He cites, as a figm-e of 

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

 first detected Stereocaulon 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. co7idensatum. The herb. Borrer. at Kew con- 

 tains similar specimens " from Llyn Gwernon," and from 



