On cephalozia (a genus of hepaticae) : its subgenera and some allied genera / by Richard Spruce.

  • Spruce, Richard, 1817-1893.
Date:
1882
Catalogue details

Licence: Public Domain Mark

Credit: On cephalozia (a genus of hepaticae) : its subgenera and some allied genera / by Richard Spruce. Source: Wellcome Collection.

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    genoiis only when the gynaecium and its envelopes occupy the whole (or very nearly the whole) of a very short branch, such an inflorescence having heretofore been mostly accounted lateral; but when it occupies the apex only of the main stem, or of a long branch, I have considered it acrogenous. Several Cephalozi^ have both the stem and its more or less elongated branches floriferous at the apex. The same thing occurs in certain subpinnate Plagiochilcs, where the $ inflorescence is mostly terminal on the branches—more rarely on the main axis—and yet is in every case to be accounted truly acrogenous. Where the stem is dichotomous, and the main axis terminates at the first forking—or (if you will) is being repeatedly doubled—the inflorescence may still be acrogenous, as is seen in Blepharostoma, the PlagiochilcB § Cristata, &c. &c.; but in the similarly-branched Bazzania the 0 flowers, consisting each of a short postical branch, are truly cladogenous.—When I speak oi flower-leaves, or anthophyls, I mean the three (more rarely only two) innermost involucral leaves, whose marginal union constitutes the tubular perianth, or colesule. They are thus exactly analogous to the petals of (for instance) the primrose, whose union constitutes the gamopetalous corolla. [The folia floralia of some authors are the leaves exterior to the whorl next the perianth, this innermost whorl alone constituting for them the true involucre. I call them, what they really are, outer bracts.] It only remains for me to gratefully acknowledge the aid I have re- ceived, in the way of specimens of many of the plants described, espe- cially from Messrs. Carrington, Hooker, Husnot, Limpricht, Lindberg, Pearson, Slater, and Stabler. ‘ Richard Spruce. Coneysthorpe, near Malton. Sept. 27th, 1882.