Rev. W. A. Leigh ton on the Lichens of Coder Idris. 409 



datis, parietibus crassulis ; si thallus non est alienus, haec spe- 

 cies proprium genus sistit, quod Heterostroma dicere liceat. 

 Conferendus est thallus in Thelopsi melathelia (quam etiam ad 

 Onegam detexit prsestantissimus Simming) etiam texturam 

 Chroolepi habens, ut facile crederes hie agi de lichenibus para- 

 sitis/' 



We scrambled to the summit, traversing the ridge, finding 

 nothing but Lecidea 7'ividosa, Ach., and L. contiyua, Fr., on the 

 very highest points, and descended by the Foxes^ Path, where 

 Allusorus crispus (Bernh.) grows abundantly, and where I also 

 gathered Placopsis gelida (L.). 



Thus this excursion has added to our British Flora a score of 

 new lichens, of which six are entirely new to lichenology, and a 

 new species of Sphceria, — proving that our Welsh mountains, if 

 thoroughly searched, would yield an abundant harvest of good, 

 rare, and novel lichens, and probably many novelties in other 

 natural orders. 



Dr. Fraser kindly permits me to add a list of the mosses 

 which he found near Dolgelley, chiefly on Cader Idris : — 



Andreaea alpina. 

 • rupestris. 



Rothii. 



Sphagnum acutlfolium (in fruit). 

 Gymnostomum rupestre. 

 Dicranum squarrosum. 



hcteromallura. 



■ falcatum. 



majus. 



Leucobryum glaucum. 

 Canipylopus longipilus. 

 Distichiuin capillaceum. 

 Didymodon rubellus. 



cylindricus. 



Trichostomura horaomallum. 

 Encalypta vulgaris. 

 Iledwigia ciliata. 

 Schistidium maritimum. (Bar- 

 mouth.) 

 Grimmia Doniana. 



patens. 



Racoraitrium aciculare. 



fasciculare. 



heterostichum. 



lanuginosum. 



Ptycoraitrium polyphyllum. 



Orthotrichum Lyellii. 



crispum. 



Diphyscium foliosura. 

 Pogonatum urnigerum. 



alpinum. 



Bryum polymorphum. 



crudum. 



pseudo-triquetrum. 



• alpinum. 



cirrhatura (intermedium). 



nutans (a variety). 



Zierii. 



Entosthodon Templetoni. 

 Physcomitrium ericetorura. 

 Bartramia fontana. 



pomiformis. 



ithyphylla.] 



arcuata. 



Tetraplodon mnioides. 

 ffidipodium Grifiithianum. 

 Anoectangium compactum. 

 Antitrichia curtipendula. 

 Ilypnum rutabulum (a variety). 



loreum. 



revolvens. 



pulchellum. 



Ann. §' A%. N, Hist. Ser. 3. Vol. xix. 



30 



