Page:The Botany of the Antarctic Voyage.djvu/337

Falklands, etc.] of fibrous tissue (b) similar to that of the liber ; at a other woody fibres are seen descending in the bark : — the more usual disposition of the tissues in the stem of this plant is shewn at Plate CVII. ter, f. 1 ,—fig. 6, a vertical section of the same through the axis of the stem, showing, at a, a bundle of woody fibres in the bark protected by very thick cells ; at b, the vessels of the liber in immediate contact with the wood ; at c, the scalariform tissue forming the wood : — all more or less highly magnified.

Plate CVII. bis, Fig. 7, stem aud branches of M. bracliystachyum ; letter a, flowering branches which fall away ; b, leaf-bearing branch elongating ; c, apex of the stem which suffers no further elongation ; figs. 8 and 9, vertical sections of stem and branches : letter A, internode of the third year ; B, internode of the second year ; a, apex of the stem ; b, nascent buds ; c, branches ; d, vascular bundles of the stem ; e, vascular bundles of the branches ; /, scar left by the fall of the leaf of the previous year ; g, lips of the vaginae : — of the natural size : fig. 10, transverse section of leaf-bearing branch, showing the solitary series of vascular bundles ; fig. 11, the same, more liighly magnified letter a, the cells originating the cuticle ; b, vessels of liber ; c, wood ; d, pleurenchyma similar to that of the liber fig. 12, transverse section of stem, two years old; letter b, the outer series of wedges of wood; c, inner ditto d, wedges belonging to a third series, placed in the medulla ; x, canty containing a bud : — more or less magnified.

Plate CVII. ter, Fig. 1, portion of a transverse section of the stem of M. brachystaeliyum, five years old ; letter a, woody cells in the bark ; b, vessels of the liber ; e, alburnum ; d, scalariform tissue of the wood ; e, slender spiral and other vessels between each layer of wood ; /, pleurenchyma similar to that of the liber, deposited with the second and third layers of wood ; g, pleurenchyina deposited during the first year at the same time as the first vessels of the liber ; //, cellular tissue between the concentric series of wedges ; the letters c', d &c, refer to the same tissues in the wedge of the inner series, and letter m indicates the pith ; fig. 2, a vertical slice from the same branch, including the same tissues viewed longitudinally; the letters indicate the same tissues as mfig. 1.

In the following figures the letters indicate the same tissues ; Fig. 3, M. linearifolium, DC, a portion of a transverse, and. fig. 4, a corresponding longitudinal slice of a stem four years old; fig. 5, a, constricted scalariform tissue of wood ; b, spirally marked vessel from between the layers of wood ; fig. 6, M. auadrifiorum, DC, portion of a transverse, xa&fig. 7, portion of a longitudinal slice, from a stem four years old.

3. Myzodendeon ollongifolium, DC; foliis oblongo- v. lineari-lanceolatis, fioribus in racemos axilJares basi folio suffultos dispositis, setis phimosis pericarpio multoties longioribus. M. oblongifoliuui, DC. Prodr. vol. v. p. 671. Ptvpp. et Endlicher, Nov. Gen. et Sp. Am. p. 1. t. 2. Delessert, Icon. Select, vol. iii. p. 47. t. 80.

Hab. South Chili and Fuegia ; Port Famine, Capf. King.

Omnia M. bracl/ystacliyi sed folia elongata et angustiora, setseque pericarpii ter longiores.

Mr. Darwin's specimens of this have male flowers only, those collected by Mi-. Eights and Webster have ripe fruit ; all agree with the excellent figure given by M. Decaisne in Delessert's Icones, in which the position of the seed in the achaenium alone is inaccurate.

4. Myzodendron qiiadrifiorum, DC; ramis florentibus elongatis ramulos alternos 3-5-floros apice unifoliatos gerentibus, foliis parvis late oblongis obtusis, achseniis linearibus, pericarpii setis gracillimis apicibus denudatis. (Tab. CVII. ter, Fig. 6 and 7.) M. cjiiadriflorum, DC. Coll. Mem. 1. 12. f. 1. Prodr. vol. iv. p. 2S6.

Hab. Strait of Magalhaens, Port Famine, Capt. King ; Staten Land, Mr. Webster.

The flowering ramuli of this species are much elongated, the leaves small, and the filaments of the pericarp very slender, with brown naked apices. A description of the wood is given at p. 300.

Plate CVII. ter, Fig. 6 and 7, wood of M. auadrifiorum ; letter b, vessels of the liber ; c, alburnum ; d, scala-