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By Alexander W. Evans

The writer's genusAcromastigum( I zero) illustrates terminal branching from either lateral and ventral segments and is the one genus of the Hepaticae with which the latter kind of branching has been linked. The branches coming up during this unprecedented 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 curious about 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 well distinct because the "Acromastigztm" kind, and its distinct gains are mentioned. within the genus Bazzania, or M astigobryum because it is usually 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 single species of Acromastigum which has to date 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 outwardly restricted to Hawaii.

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Extra resources for A Revision of the Genus Acromastigum

Sample text

La Perouse, without date, A. ), cited by Stephani as Mastigobryum Mooreanum (39, p. 540). \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.

18. A. laevigatum (p. I 0 I). Ventral leaf-divisions linear, two cells wide except at the apex . . 19. A. Cunninghamii (p. 106). 16. ::VIarginal cells of the dorsal divisions distinctly larger than the submarginal cells . . . . . . 20. A. obliquatum (p. 110). ::V1arginal cells of the dorsal divisions subequal in size to the submarginal cells . . . . . . . . 21. A. microstictum (p. 115). 17. Superficial walls of leaf-cells plane or nearly so . 18 Superficial walls of leaf-cells distinctly convex, in some cases with a median tubercle .

I 4 mm. in width. The most typically developed underleaves, such as the one shown in Fig. 7, F, have two narrow and acute sinuses at the apex, separating three low crenations less than two cells high, which are obtuse, rounded, or subtruncate. These crenations, which represent the divisions of species with trifid underleaves, are tipped with two cells side by side or, more rarely, with a single cell. On each side of the underleaf a rounded projection is present. Many of the underleaves, however, do not show this typical structure.

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