1036 



tween either the setae, or the capsules inclosed in this double calyp- 

 tva, and the appearance is evidently occasioned by the two calyptrse 

 growing together at an early stage. The capsules in this specimen 

 were quite young. T. Edmonston, jdn. 



Aberdeen, May, 1844. 



[Mr. T. Sansom (Phytol. 93) has described a precisely similar state of Polytricbum 

 commune ; and at the same lime mentions a specimen of P. juniperinum in tlie same 

 state, collected by Mr. W. Gardiner. — Ed.'] 



Art. CCXXVIII. — Sketch of a Botanical Ramble to Twll dii, June 

 19, 1844. By Joseph Sidebotham, Esq. 



During a short stay at Beaumaris in June, I made an excursion 

 among the Caernarvonshire mountains, taking the route through Ban- 

 gor, along the Capel Curig road, through the Penryn slate- quarries to 

 Twll du, thence crossing the mountains to Llanberis, and the follow- 

 ing day making the ascent of Snowdon, returning by the lakes and 

 through the Llanberis quarries. 



Having been unsuccessful in one of the objects of my journey, viz., 

 to procure Lloydia serotina, from its inaccessible situation, I deter- 

 mined on a second excursion. A friend from Bangor accompanied 

 me. We took a conveyance as far as the Penryn quan'ies, having 

 previously agreed with one of the workmen to accompany us, and to 

 bring a rope. The morning was not one of the most promising for a 

 botanical expedition, the mountains being completely hidden by a 

 thick mist, while occasionally there fell a little rain. Nothing parti- 

 cular occurred during our walk along the road. Allosorus crispus 

 was very plentiful on the walls, and we saw plenty of Saxifraga stel- 

 laris on the wet, rocks. 



Twll du is situated to the right of the road, just at the commence- 

 ment of Llyn Ogwen, a large lake which borders the pathway on the 

 left hand. Here commenced our ascent, which lay over fragments of 

 rock and heathy ground, abounding in Lycopodium Selago and alpi- 

 num. In a short time we reached Llyn Idwel, a lake of considerable 

 extent, the shore of which was lined with fragments of Isoetes lacus- 

 tris, and the bottom is in some parts covered with it, growing inter- 

 mixed with Lobelia Dortmanna. Subularia aquatica also grows here 

 in plenty ; but we did not find any in flower, being a little too early 

 in the season. 



