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Porphyra yezoensis bei Helgoland — eine entwicklungsgeschichtliche Studie

Porphyra yezoensis at Helgoland — a developmental study


APorphyropsis-like epiphytic specimen found in the harbour of Helgoland was grown in culture and proved to be identical with the JapanesePorphyra yezoensis. Life history studies on this economically important alga resulted in some interesting and hitherto unknown details. The variability of the adult frond is fundamentally determined by the pattern of spore germination. Settled onChaetomorpha filaments, monospores elongate within 20 minutes; the epiphytic germlings are attached to the substrate by a typical basal cell and give rise exclusively to elongated fronds provided with a cuneate base. Unattached spores, however, germinate into buds with rhizoids; they develop into elongated elliptical to oval fronds provided with round or cordate bases. Only plants with male areas were observed in the cultures, butConchocelis was abundantly produced from cells of aged thalli. Grown in mussel-shells, the filamentous phase liberated conchospores for a long time.


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Herrn Paul-Heinz Sahling zum 75. Geburtstag gewidmet, mit Anerkennung und Dank für 50jährige Zusammenarbeit.

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Kornmann, P. Porphyra yezoensis bei Helgoland — eine entwicklungsgeschichtliche Studie. Helgolander Meeresunters 40, 327–342 (1986).

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