Read e-book online A Revision of the Genus Acromastigum PDF

By Alexander W. Evans

The writer's genusAcromastigum( I zero) illustrates terminal branching from either lateral and ventral segments and is the single genus of the Hepaticae with which the latter form of branching has been linked. The branches coming up during this unparalleled demeanour are flagelliform in personality, and every exhibits on the base a slim and incomplete underleaf. This represents the a part of the phase that used to be no longer interested by the formation of the department. within the writer's dialogue of branching within the leafy Hepaticae (II, p. 23), terminal branching from ventral segments is easily amazing because the "Acromastigztm" style, and its special beneficial properties are mentioned. within the genus Bazzania, or M astigobryum because it is frequently referred to as, the ventral flagelliform branches are intercalary in foundation and come up within the axils of underleaves. with the exception of this significant distinction the genera Acromastigum and Bazzania have a lot in universal, and the one species of Acromastigum which has thus far been famous was once origi nally referred, with a few doubt, to the genus M astigobryum. This species, that is referred to now as A. integrifolium (Aust.) Evans, is seemingly constrained to Hawaii.

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Rsox (5, p. \:\I (39, p. 539), who does not give the collector's name. The plants grow in depressed mats, either in pure colonies or mixed with other bryophytes, and present many xerophytic features. Except close to the apex, they are deeply pigmented with yellowish brown or reddish brown, and the axial organs may become almost black with age. The stems are longer than in any of the preceding species, with the exception of A. , with the acutely spreading dichotomies 5-20 mm. apart. 25 mm. 2 mm.

Cells from a perichaetial bract of innermost series, X 225. The figures were drawn from the type-material. or nearly so for more than half its length and then curves gently forward. These features are clearest in leaves which are dissected off and spread out flat (Fig. 6, C, D). 12 mm. in width. The sinus, which is one-third to one-half the length of the leaf is acute and very narrow. The divisions, in consequence, may diverge at a small angle, lie in contact, or slightly overlap. Both divisions point obliquely forward in attached leaves, and the acute apices are tipped with a single A REVISION OF THE GENUS ACROMASTIGUM 39 cell or, on some of the dorsal divisions, with a row of two cells.

The thickest walls, which are in the ventral part of the leaf toward the base, often attain a thickness of 4-5 f1. and show the middle lamellae with unusual distinctness. The cell-cavities, although sometimes more or less rounded at the angles, retain in many cases their original polygonal form. At the base of a detached leaf one or more of the intermediate cells can often be detected. These are usually six in number and are only a little larger than the basal leaf-cells. The cuticle is smooth throughout.

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