A Revision of the Genus Acromastigum by Alexander W. Evans

A Revision of the Genus Acromastigum by Alexander W. Evans

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 unheard of demeanour are flagelliform in personality, and every exhibits on the base a slender and incomplete underleaf. This represents the a part of the section that was once no longer focused on 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 extraordinary because the "Acromastigztm" variety, and its detailed gains are mentioned. within the genus Bazzania, or M astigobryum because it is usually referred to as, the ventral flagelliform branches are intercalary in starting place 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 this point been well-known used to be 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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Leaves, X 225. E. Dorsal base of lea f, x 225. F-H. Underleaves, x 225. I. Leaf of flagelliform branch, X 225. ] , K . Perigonial bracts, X 50. L. Ape x of dorsal division of bract s hO\Yn in] , x 225. M. Perigonial bracteole, x 50. The fi gures were dra wn from the type-material. third to one-half the length of the leaf and separates the divisions slightly. The latter are triangular and acute and are tipped with a single cell or with a row of two cells. In the best developed leaves, such as the one shown in Fig.

In width. The cells of the marginal row, of the submarginal row toward the apex, and of the third row from the margin average about 20 f1. · The cell-walls, for the most part, are uniformly thickened, without evident trigones or pits, but the cell-cavities have rounded angles. 1. · The cuticle is smooth. The usual evidence of a bidenticulation is a shallow depression close to the apex on the dorsal margin of a leaf. This depression in most cases is situated between the terminal cells of the submarginal row and of the third row from the margin (Fig.

In width. Their outline (Fig. 8, G) is broadly subquadrate, and their sides usually bulge a little. The narrow and acute sinuses do not extend quite to the middle. The divisions, which are often subequal, are, in most cases, two or three cells wide at the base and two cells long. The apices are either truncate and two cells wide or subacute and tipped with a single cell. The basal portion of the underleaves is usually six to eight cells wide and two cells high. It may, however, appear to be 48 ALEXAXDER W.

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