300 88. PTEEIDIOIDES. 



found considerably below the fact. As with, the case of 

 the Isoetes, the single or few known stations in Suther- 

 land may possibly not be on the northern side of 58 

 latitude. The Eev. W. W. Spicer found it growing sub- 

 mersed in a lake near Guildford, where the water was 

 forty inches deep (Phytol. iv. 350). 



1420. Equisetum Telmateia, Ehrh. 



Ai-ea 1 2 3 4 5 G 7 8 9 10 11 12 13 14 15 16 * [18]. 



South limit in Cornwall, Isle of Wight, Kent. 



North limit in Aberdeen or Kincardine ? Forfar, Argyle. 



Estimate of provinces 16. Estimate of counties 60. 



Latitude 50 — 57. English type of distribution. 



Agrarian region. Inferagrarian — Midagi-arian zones. 



Descends to the coast level, in the Peninsula. 



Ascends to 100 or 200 yards, in England. 



Range of mean annual temperatiu'e 52 — 47. 



Native. Uliginal, &c. In most English counties, but 

 apparently in few Scottish. In Flora Abredonensis, the 

 most northern list in which I find this species mentioned 

 (except Orkney, which I fear to rely uj)on), its habitat is 

 curtly given thus : — " Loch of Drum, &c. Not unfre- 

 quent." The Loch of Drum is in that smaU portion of 

 Kincardineshii'e which is situate on the northern side of 

 the river Dee ; and thus it does not clearly appear whether 

 E. Telmateia actually grows within the limits of Aberdeen- 

 shire or not so. Moreover, I confess some suspicion that 

 the " E. fluviatile " (or " Great Water Horsetail ") of the 

 Flora Abredonensis may truly be the branched state of 

 E. limosum, although at its date of publication (1838) the 

 name of "fluviatile" was usually applied to the species 



