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A taxonomic revision of a Hypnea charoides‐valentiae complex (Rhodophyta, Gigartinales) in Japan, with a description of Hypnea flexicaulis sp. nov.
Author(s) -
Yamagishi Yukimasa,
Masuda Michio
Publication year - 2000
Publication title -
phycological research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.438
H-Index - 44
eISSN - 1440-1835
pISSN - 1322-0829
DOI - 10.1046/j.1440-1835.2000.00181.x
Subject(s) - gigartinales , biology , botany , ecology , algae
SUMMARY Morphology of a Hypnea charoides‐valentiae complex (Rhodophyta, Gigartinales) in Japan is investigated on the basis of field‐collected and cultured plants. We can recognize two species, Hypnea charoides Lamouroux and H. flexicaulis Yamagishi et Masuda, sp. nov., which are distinguished by: (i) conspicuous percurrent main axes growing straight in the former versus less conspicuous percurrent main axes growing flexuosely in the latter; (ii) narrow branching angles (less than 90°) in the former versus wide branching angles (up to 150°) in the latter; (iii) the presence of branches and branchlets showing abrupt adaxial bending in the former versus those showing pronounced abaxial bending, some growing into hooked branchlets in the latter; and (iv) the absence (in the former) or presence (in the latter) of antler‐like branches. Nucleotide sequences of the plastid‐encoded large subunit of the ribulose‐1,5‐bisphosphate carboxylase/oxygenase gene ( rbc L) support the differentiation of these two entities: the pairwise distance between them was 83 b.p. (6.2%).