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 kind 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 considering 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 exceptional because the "Acromastigztm" style, and its distinct positive aspects are mentioned. within the genus Bazzania, or M astigobryum because it is usually referred to as, the ventral flagelliform branches are intercalary in beginning and come up within the axils of underleaves. aside from this significant distinction the genera Acromastigum and Bazzania have a lot in universal, and the one species of Acromastigum which has to this point been famous was once origi nally referred, with a few doubt, to the genus M astigobryum. This species, that's referred to now as A. integrifolium (Aust.) Evans, is seemingly constrained to Hawaii.
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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 kind of branching has been linked. The branches bobbing up during this remarkable demeanour are flagelliform in personality, and every indicates on the base a slender and incomplete underleaf.
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Additional resources for A Revision of the Genus Acromastigum
Underleaf-divisions about as long as broad, not bidentate at the apex 7 Underleaf-divisions a bout twice as long as broad . . . . 8 7. Leaves distinctly longer than broad, unistratose throughout . . 9. A. anisostomum (p. 48) Leaves slightly or not at all longer than broad, bistratose in places . 1o. A. brachyphyllum (p. 60) 8. Leaves with a distinct rounded to subauriculate expansion at the dorsal base; underleaf-divisions not bidentate at the apex . . 11. A. echinatiforme (p. 64). Leaves not expanded at the dorsal base; underleaf-divisions in many cases bid en tate at the apex.
Leaves, X 225. E , F. Underleaves, X 225. G. Perichaetial bract from innermost series, x 50. H. 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.
He shows further that the species is adapted to xerophytic conditions. The leaves, for example, which are reduced to a minimum, do not spread widely; the walls of their cells are strongly thickened; and the same thing is true of the walls of the superficial layer of the axes. The whole organism is thus rendered firm and rigid and might be said to have assumed the character of a desert plant. Certain characters of A. filum give it a unique place in the genus. The transverse attachment of the leaves, for example, separates it from all the other known species with bifid leaves and is found nowhere else in the genus except in A.
A Revision of the Genus Acromastigum by Alexander W. Evans