SOME BRYOLOGIGAL PHOTOGRAPHS FROM NORTH WALES^ 

 P. G. M. Rhodes 



The bryologist will hardly find richer ground in Europe than the shady 

 ravines which penetrate the Welsh hills. The writer recently spent a holiday 

 in the company of Mr. D. A. Jones, the well known hepaticologist of Harlech^ 

 Merioneth, and was able to photograph some of the more interesting spots in 

 that district. The photographs will give some idea of the rich "Atlantic" flora. 



Photograph No. I. Shady siliceous rocks (western aspect) in a mountain 

 wood in the Artro Valley, Merioneth. As a rule the dominant moss in the 

 wood is Isothecium myosuroides, occurring on every rock in thick cushions. On 

 damp rocks, such as that one shown, fine patches of Hymenophyllum Wilsoni are 

 noticeable: and occasionally a magnificent mass of the still rarer H. tunhridgense 

 may be seen. The most noticeable hepatics are the Plagiochilas; in the picture 

 P. asplenioides and P. spinulosa are both seen; Saccogyna viticulosa is also there 

 in dense cushions on the face of the rock, though it does not fruit in this local- 

 ity. A close inspection of the tufts of moss on the rock produced the rather 

 rare Scapania nemorosa var. uliginosa (this, of course, cannot be seen in the 

 photograph), while the Scapania gracilis rivals the Plagiochilas in robustness 

 and abundance. On the wet rocks near the mouth of the cave two Lejeuneas 

 occur; the common L. cavifolia and the rarer L. patens. 



Photograph II. Dinas River, Uchartro, Harlech. Gives a good idea of 

 the rich moss vegetation which clothes the boulders by these mountain streams. 

 The bulk of the moss shown is Rhynchostegium rusciforme, Brachythecium plu- 

 mosum, and Isothecium myosuroides; on one of the boulders a patch of Hygrohyp- 

 num eugyrium occurs; in the crevices of the rocks and among the tufts of moss 

 Metzgeria conjugata and Lejeunea cavifolia are found. Within a few yards of 

 the spot shown, the rocks among which the stream flows, are covered with lux- 

 uriant masses of Madotheca Porella. 



Photograph III. A picturesque spot at the head of Ceuna't Llenyrch, a 

 ravine running into the siliceous hills behind Harlech. The seated figures are 

 Mr. D. A. Jones and his young son Idris. The big boulder is covered with the 

 robust mountain variety rivulare of Isothecium myosuroides. The sandy detritus 

 among the stones in the foreground is an excellent locality for Scapania suh~ 

 alpina and Eucalyx obovata. On other rocks Rhacomitrium protensum was 

 noticed; and Grimmia retracta, so typical of the siliceous Welsh hills, occurs in 

 black tufts everywhere on the stones. 



Photograph IV. The same place, showing rocks close to waterfall. The 

 rocks in the middle are covered with a sheet of Hyocomium flagellare, which 

 fruits freely. On the left Isothecium myosuroides rivulare takes its place, with 

 patches of Brachythecium plumosum. Metzgeria conjugata flourishes, and 

 Lepidozia Pearsoni knits together the stems of more robust species with its 

 delicate threads. Not shown in the picture, but within a few yards, occur Stere- 



1 See Plate I. 



