A Revision of the Genus Acromastigum by Alexander W. Evans

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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 form of branching has been linked. The branches bobbing up during this extraordinary 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 was once no longer interested in 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 exclusive because the "Acromastigztm" variety, and its designated gains are mentioned. within the genus Bazzania, or M astigobryum because it is usually known as, the ventral flagelliform branches are intercalary in starting place and come up within the axils of underleaves. apart from this significant distinction the genera Acromastigum and Bazzania have a lot in universal, and the single species of Acromastigum which has to date 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 outwardly restricted to Hawaii.

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L, and the medullary cells show thickenings at the angles and thin places in some of the lateral walls. The imbricated leaves (Fig. 7, A) spread normally at an angle of 45 degrees or a little more. The upper surface is distinctly convex, and the ventral margin, at least toward the base, appears in profile view from below. In some cases, just as in A. capillare, the leaves are appressed to one another and to the axis, but on most of the plants spreading leaves are greatly in the majority. The dorsal base is rounded to minutely subcordate (Fig.

08 mm. 1 mm. 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.

7, H, both sinuses arc almost obsolete, and the same thing is true of the crenations; the lateral projection on the right-hand side is lacking but the one on the opposite side is present. Such an underleaf might almost be described as undivided and bears a marked resemblance to the undivided underleaves of the Exilia. The underleaves of A. tenax are, in most cases, four cells high and eight to ten cells wide at the base. Two cells 44 ALEXANDER W. EVAXS, thus correspond with the median crenation, and three or four cells with each lateral crenation, together with the lateral projection.

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