298 HARVEY’S ILLUSTRATIONS, 
Chalmers himself expresses a doubt of his L. debilis proving 
any thing else than a more advanced state of P. plantaginea. 
In form, size, substance and colour, it is allowed that the 
Islay and Devonshire plants perfectly agree; but it is asserted 
that the former have the closely cellular structure of Lamina- 
ria, the latter the reticulated or dictyoteous structure of Puncta- 
ria. This dissimilarity I have not been able to discover, for 
though I have subjected both to a rigid microscopic examina- 
tion and dissection, I cannot perceive the most trivial structural 
character to distinguish them. Both are truly dictyoteous and 
entirely the same in genus and species: I cannot even detect 
sufficient differences to establish a variety. 
I trust Dr. Greville’s specific name “latifolia” will be 
retained for the united species; for though **debilis" has 
undoubtedly the claim of priority; and was quite applicable 
to the plant whilst considered a Laminaria, it would be 
rather too absurd, for the mere sake of preserving an older 
name, to attach such an epithet to the largest and finest 
species of Punctaria. 
DICTYOTE.JE. 
2. Striaria attenuata. Grev.— Hook. Br. Fl. v.ii. p. 219. 
. &c.—' To the habitats already given in British Flora, add 
Torbay, Mrs. Griffiths—and Sidmouth, Miss Cutler. 1833. 
3. Asperococcus castaneus, Carm.— Hook. Br. Fl. v. ii. P- 
277, Mrs. Griffiths has sent me a series of specimens which 
prove that this supposed species is only the young state of 
Chorda lomentaria. 
ECTOCARPEZ. 
mores ud Sphacelaria disticha.—Harv. in Hook. Br. Fl. v. ii. P- 
323. Since the publication of the British Flora, my friends 
Mrs. Griffiths and Miss Cutler have convinced me that the 
plant I formerly described under this name is merely a form 
of S. scoparia. The latter lady, who finds both states com" 
monly at Sidmouth, has kindly communicated an extensive 
