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- Title
MORPHOLOGY AND DEVELOPMENT OF <em>AHNFELTIA PLICATA</em> (RHODOPHYTA): PROPOSAL OF AHNFELTIALES ORD. NOV.
- Authors
Maggs, Christine A.; Pueschel, Curt M.
- Abstract
Ahnfeltia plicata (Hudson) Fries, the type species of Ahnfeltia Fries, is currently assigned to the Phyllophoraceae (Gigartinales). Several morphological and biochemical characters distance A. plicata from the Phyllophoraceae but, because sexual reproduction has never been demonstrated, an alternative placement has not been possible. A. plicata now is shown to have a heteromorphic sexual life history. Erect branched gametophytes are dioecious. In male sori, spermatangia are cut off transversely from spermantangial mother cells. Female sori form numerous terminal sessile carpogonia. Following fertilization, several zygotes in each sorus fuse facultatively with undifferentiated intercalary female sorus cells and with each other, then grow radially outward in the compound external carposporophyte and terminate in carposporangia. Carpospores develop in culture into crustose tetrasporophytes identical to Porphyrodiscus simulans Baters. Field-collected P. simulans tetraspores grew into erect A. plicata axes. Tetrasporangia are formed by division and enlargement of crust apical cells followed by sequential enlargement and maturation of tetrasporocytes in an erosive process. Monosporangia are formed in sori on male gametophytes. Pit pligs of both gametophyte and tetrasporophyte phases consist of naked phug cores without caplayers of membranes. Gametophytes exhibit both cell fusions and secondary pit connections whereas tetrasporophytes form cell fusions but lack secondary pit connections. On the basis of the unique female and postfertilization reproductive development and in conjunction with the pit plug structure which is unique among florideophytes, the order Ahnfeltiales, containing the family Ahnfeltiaceae, is proposed.
- Subjects
PHYLLOPHORACEAE; AHNFELTIA; PLANT morphology; PLANT phylogeny; RED algae
- Publication
Journal of Phycology, 1989, Vol 25, Issue 2, p333
- ISSN
0022-3646
- Publication type
Article
- DOI
10.1111/j.1529-8817.1989.tb00131.x