298 88. PTERIDIOIDES. 



it is probable enough. I have only one note of a station 

 above 950 yards; namely, close under the summit of one 

 of the Breadalbane peaks which I estimated at nearly 

 1100 yards. 



t Lycopodium helveticum, Linn. 



Area [1 * 3]. 



Incognit. The Rev. W. W, Spicer has recently sug- 

 gested or revived a question, " respecting the occurrence 

 of Selaginella helvetica in Britain", in a letter of inquiry 

 to the readers of the Phytologist. I fear that the intro- 

 duction of specimens of this plant into some old herbaria, 

 •will afford only another of the many evidences of that 

 carelessness or indifference about the true habitats and 

 localities of plants, which characterized botanists before 

 the present centmy, and even stUl does characterize many 

 of those now living. 



1418. IsoETES LACusTRis, L'mn. 



Ai-ea * * * * [5] 6 7 * * 10 11 12 * * 15 16 17. 

 South limit in Brecon, North Wales, York. 

 North limit in Sutherland, Skye, Aberdeen. 

 Estimate of pro\iuces 8. Estimate of counties 20. 

 Latitude 52 — 59. Highland ij^e of distribution. 

 A. A. regions. Midagrarian — Inferarctic zones. 

 Descends nearly to the coast level, in Lake province. 

 Ascends to 500 or 600 yards, in East Highlands. 

 Range of mean annual temperature 47 — 41. 

 Native. Lacustral. Occurs in many lakes among the 

 mountainous tracts ; but how high up the moimtains I am 



