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A Revision of the Genus Acromastigum (Paperback, 1934 ed.)
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A Revision of the Genus Acromastigum (Paperback, 1934 ed.)
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The writer's genusAcromastigum( I 0) illustrates terminal branching
from both lateral and ventral segments and is the only genus of the
Hepaticae with which the latter type of branching has been
associated. The branches arising in this exceptional manner are
flagelliform in character, and each shows at the base a narrow and
incomplete underleaf. This represents the part of the segment that
was not involved in the formation of the branch. In the writer's
discussion of branching in the leafy Hepaticae (II, p. 23),
terminal branching from ventral segments is definitely
distinguished as the "Acromastigztm" type, and its distinctive
features are pointed out. In the genus Bazzania, or M astigobryum
as it is often called, the ventral flagelliform branches are
intercalary in origin and arise in the axils of underleaves. Except
for this important difference the genera Acromastigum and Bazzania
have much in common, and the only species of Acromastigum which has
so far been recognized was origi- nally referred, with some doubt,
to the genus M astigobryum. This species, which is now known as A.
integrifolium (Aust.) Evans, is apparently confined to Hawaii.
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