160 



texture, appearing quite white and homy." Mr. Sansom, however, 

 suggests, with great propriety, the probability of the seeds which he 

 examined being in different stages of maturity ; those which I have 

 examined do not exhibit the differences which he has pointed out. 



The following definitions appear to me to express the distinguish- 

 ing characters of the two forms, 



a. Normal form. Fronds 6 to 15 in number, 2 to 5 inches in length, spreading, 

 very brittle : tuber as large as a hazel-nut, slightly bilobed ; radicles about as 

 long as the leaves, rarely divided. This form is represented in the figure at the 

 head of this article ; the full length of the radicles being shown at p. 156. 

 /3. Slender form. Fronds 20 or more in number, 12 or 18 inches long, very erect 

 and compact together : tuber very small, mostly to be distinguished with diffi- 

 culty ; radicles less than one fourth the length of the leaves, frequently divided. 



The two forms grow together in the lakes of England, Scotland 

 and Wales. Edwaed Newman. 



(To be continued). 



Art. lit. — List of Plants found in Devonshire 8f Cornwall, not men- 

 tioned by Jones in the Flora Devoniensis, with remarks on the 

 rarer Species. By The Rev. W. S. Hore, M.A., F.L.S., G.S.* 

 Communicated by Edwin Lankester, M.D., F.L.S., F.B.S.E. 



It was my intention to have prepared a list of the plants indigenous to the coun- 

 ties of Devon and Cornwall, accompanied with remarks on the rarer species, but when 

 I considered that a Flora of the former county existed, published about twelve years 

 since, I detenuined on limiting my observations to an enumeration of such species as 

 have since been discovered in Devon, and those which are found in Cornwall, but 

 which have not been met with in the sister county. The latter are so few in number, 

 that Jones's ' Flora Devoniensis ' may be considered as a Flora of the two western 

 counties, and the whole district, when geographically viewed, would induce us to ar- 

 rive at the conclusion that much discrepancy could not possibly exist in their natural 

 productions. In the eastern portion of Devon, where the geological aspect of the 

 county begins to merge into the newer formations of Dorsetshire and Hampshire, we 

 might indeed be inclined to expect a more distinctly marked vegetation, and some 

 plants not to be found towards its western limits ; this however is not the case, for with 

 the exception of that singularly rare plant — Lobelia urens, which is confined to the 

 neighbourhood of Axminster, no distinct plants have as yet been detected. A similar 

 result obtains with reference to the interior part of the county, where, notwithstanding 

 some of the torrs of Dartmoor reach the lower limits of the Upland Region of Watson, 

 no plants characteristic of that region have been discovered, except Listera cordata, 

 recently found by Mr, Ward, on Coddon Hill, near Barnstaple. 



We may therefore view these two western counties, with a portion of Somerset, i. e. 

 Exmoor and its vicinity, as forming one large botanical district, connecting England 



* Read at the Meeting of the British Association held at Plymouth, August, 1841. 



