Ultrastructural observations of tetrasporangia and conceptacles inHildenbrandia(rhodophyta: Hildenbrandiales)
Open Access
- 1 September 1982
- journal article
- research article
- Published by Informa UK Limited in British Phycological Journal
- Vol. 17 (3), 333-341
- https://doi.org/10.1080/00071618200650331
Abstract
Ultrastructural techniques were used to investigate tetrasporangial development and conceptacle contents of Hildenbrandia occidentalis Setch. and H. rubra (Sommerf.) Menegh. = H. prototypus Nardo. Tetrasporocytes are formed by transformation of vegetative cells. A distinctive tetrasporangial wall is deposited around the tetrasporocyte. Cleavage of the tetrasporocyte is effected by mucilage-filled furrows initiated successively, but completed simultaneously. Following discharge of the tetraspores, the cell subtending the sporangium becomes a tetrasporocyte. Repetition of this process enlarges the conceptacle. True paraphyses and regenerative stalk cells were not observed in either species. Tetrasporangial walls persist in the conceptacle after spore release and, presumably, these are responsible for some of the reports of paraphyses. The implications of these findings for the intrageneric taxonomy of Hildenbrandia are considered. The unique mode of tetrasporogenesis found in the HIldenbrandiaceae supports segregation of this family into a separate order.Keywords
This publication has 6 references indexed in Scilit:
- Rhodophycean Pit Plugs: An Ultrastructural Survey with Taxonomic ImplicationsAmerican Journal of Botany, 1982
- A sexual life history in Rhodophysema (Rhodophyceae): a re-interpretationPhycologia, 1982
- ULTRASTRUCTURE OF TETRASPOROGENESIS IN PALMARIA PALMATA (RHODOPHYTA)Journal of Phycology, 1979
- A Preliminary Consideration of the Taxonomic Position of Palmaria Palmata (Linnaeus) Stackhouse = Rhodymenia Palmata (Linnaeus) GrevilleJournal of the Marine Biological Association of the United Kingdom, 1974
- Phycological notes. VI. New records, new combinations, and noteworthy observations concerning marine algae of CaliforniaPhycologia, 1971
- Culture and Development of Hildenbrandia rivularis from Denmark and North AmericaAmerican Journal of Botany, 1965