Remarks on the so-called woody and vascular tissues of ferns / by George Ogilvie.

  • Ogilvie, George
Date:
1860
Catalogue details

Licence: Public Domain Mark

Credit: Remarks on the so-called woody and vascular tissues of ferns / by George Ogilvie. Source: Wellcome Collection.

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    Polypodium alpestre. The petiole has two flattened fasciculi, without dark sheaths, which, as they pass upwards, run into one of a horseshoe sec¬ tion, with the convexity towards the back of the stalk. The rhizome is of pale tissue, with a brown cuticular layer, I and occasionally with a faintly-marked stratum of darker cells surrounding the fasciculi of the netted cylinder*. I Polystichum Lonchitis, The petiole has two large lateral fasciculi, and one or more intermediate, of smaller size, sparingly anastomosing with each other and with the former; all without dark sheaths. The rhizome has the fasciculi of the netted cylinder indurated in places by the conversion of part of the cambium-coat into fibres with an internal brown deposit; but there are no dark tracts in the general parenchyma. Polystichum aculeatum. The petiole has numerous fasciculi invested with dark sheaths, and sparingly connected by slender transverse branches. The rhizome, at the origins of the petioles, has deep indenta¬ tions running into the interstices of the netted cylinder. The whole substance is of pale tissue, except the cuticular layer. Lastrea Filix mas. The petioles as in the last species. The rhizome is of pale tissue (except a brown cuticular layer), thick and fleshy, with the netted cylinder deeply imbedded in its substance; the vascular fasciculi and their cambium-coat have a brownish tint. Lastrea dilatata. Petiole and rhizome as in the last species, except that the rhizome has numerous isolated fusiform nodules, of a very dark tissue, in the parenchyma within the netted cylinder. Lastrea Oreopteris. The petiole has two fasciculi, and a tract of dark tissue on the i inner margin of each, meeting its fellow at the point where the [ fasciculi are connected with the netted cylinder of the rhizome. The rhizome is of pale substance, with a cuticular layer of f brown tissue; and a transverse section shows dark spots in the I line of the netted cylinder, at the points of convergence of the tracts of the petioles. * These characters apply in some degree to all the specimens which have been shown me as of this species, though differing considerably in the general appearance of the fronds.
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