412 
APPENDIX C. 
dentations alternating with the teeth, and, like them, equal in number to the 
ridges. The teeth are distinct, never adhering, obtuse, somewhat ovate, black 
in the centre, with a broad, white, membranous margin, and tipped with a short 
bristle, which is either black or white, and more or less deciduous, while the 
teeth themselves are persistent. Catkins terminal, rather large in proportion to 
the size of the plant. 
These descriptions are intended to apply to the plants only “ as found on the 
banks and in the bed of the river Dee,” and as seen either with the naked eye 
or through a small lens. I have endeavoured to exclude everything that could 
not with propriety be admitted as a specific distinction. The characters which 
I have given, and which I find to be constant, * * * 
have led me to the conclusion that the three plants are well entitled to be 
ranked as distinct species. I conceive that the main strength of my posi- 
tion lies in the fact, that amidst all the varieties of size and shape which 
each plant presents, the distinctive characters remain the same. The species 
never shade off into one another, the smallest specimen of the largest species 
being readily distinguished from any specimen of the other two ; while, on 
the other hand, the stoutest stems of E. Mackaii and variegatum can at once be 
recognized as distinct from each other, and from the slenderer stems of E. 
hyeniale. 
(C, p. 44). 
Observations on the Linnean Specimens of Equisetum. By Edward 
Newman. (From ^The Phytologist/ p. 530). 
It is, I believe, generally known that the Linnean herbarium was purchased 
by Sir J. E. Smith, and subsequently by the Linnean Society of London, in 
whose possession it now remains. The specimens are fixed on half sheets of 
foolscap paper; they are named by Linneus himself, in his own handwriting, 
and have also the comments of Sir J. E. Smith, wherever it appeared to him 
necessary or useful to add an explanatory note, A few labels with MS. notes 
are pasted in, but I am not certain of their author. The Equiseta are com- 
prised in a fasciculus of nine folios : the fasciculus is endorsed thus, — “ 1169, 
Equisetum,” in the handwriting of Linneus. 
In the same apartment are preserved the author’s own copies of the first and 
second editions of the ‘ Species Plantarum.’ In the first all the species possess- 
ed by the author are distinguished by a particular mark ; and the second is en- 
riched with his own unpublished notes. I will now endeavour to combine the 
information obtained from these several sources, only quoting the published cha- 
racters when requisite, and adding remarks of my own on every specimen. 
