Reproductive morphology of Gastroclonium pacificum (Champiaceae,Rhodymeniales) from Japan |
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Authors: | Masahiro Suzuki Tetsuo Hashimoto Hisayoshi Nozaki |
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Institution: | 1. Department of Biological Sciences, Graduate School of Science, University of Tokyo, , Bunkyo‐ku, Tokyo;2. Institute of Biological Sciences, University of Tsukuba, , Tsukuba, Ibaraki, Japan |
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Abstract: | Morphological studies were undertaken on Gastroclonium pacificum (E.Y. Dawson) C.F. Chang et B.M. Xia (Champiaceae, Rhodymeniales) from Japan. We describe the details of male reproductive structures, the procarp and early post‐fertilization stages. This species has a solid axis, with both tetrasporangia and polysporangia, spermatangia are cut off from spermatangial parent cells, and a procarp is composed of a 4‐celled carpogonial branch and two 2‐celled auxiliary cell branches. The mature cystocarp lacks a conspicuous ostiole, a characteristic of the genus Gastroclonium. The most distinctive characteristic of the species is the tela arachnoidea, which is lacking in other species of Gastroclonium. |
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Keywords: | carposporophyte development Champiaceae Gastroclonium pacificum Rhodymeniales Rhodophyta |
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