Marginisporum (Yendo) Ganesan, 1968

Holotype species: Marginisporum crassissimum (Yendo) Ganesan

Currently accepted name for the type species: Corallina crassisima (Yendo) K.Hind & G.W.Saunders

Original publication and holotype designation: Ganesan, E.K. (1968). Studies on the morphology and reproduction of the articulated corallines - III. Amphiroa Lamouroux emend. Weber van Bosse. Phykos 6: 7-28, 39 figs, 1 plate.

Description: Thalli comprising crustose holdfasts bearing one to several erect, variously branched, articulated fronds. Fronds of calcified intergenicula separated by uncalcified genicula. Intergenicula of arching tiers of straight medullary cells surrounded by a photosynthetic cortex and a unistratose layer of epithallial cells. Cells in contiguous filaments often fusing; secondary pit-connections lacking. Genicula consisting of single tiers of long, straight, unbranched cells uncalcified except where they project into neighboring intergenicula. Trichocytes presumably present, but unknown. Reproductive cells forming within conceptacles originating on intergenicular margins near branch apices (marginal conceptacles) or in lateral conceptacles originating in cortex lower in the frond (lateral conceptacles). At maturity, one to several conceptacles with central pores protruding from intergenicular surfaces. Conceptacles lacking surmounting branches. Tetrasporangial conceptacles containing >30 mature sporangia prior to spore discharge. Bisporangia unknown. Sexual plants dioecious. Pores of spermatangial conceptacles opening at tip of short beak. Carpogonial conceptacles with extensive layer of supporting cells with carpogonial filaments. Carposporangial conceptacles containing broad, thin fusion cells with gonimoblast filaments arising from upper surface. Spores presumably germinating into crustose sporelings by the Corallina-type of spore germination. Subsequent growth is into a slowly spreading crust from which fronds develop.

Information kindly contributed by H.W. Johansen but may now be outdated.

Taxonomic status: This name is currently regarded as a synonym of Corallina.

Most recent taxonomic treatment adopted: Hind, K.R. & Saunders, G.W. (2013). A molecular phylogenetic study of the tribe Corallineae (Corallinales, Rhodophyta) with an assessment of genus-level taxonomic features and descriptions of novel genera. Journal of Phycology 49(1): 103-114.

Comments: Marginisporum is endemic to Japan and Korea where is is fairly common. Marginisporum is among the robust articulated genera with strongly flattened intergenicula. Key characters are the presence of marginal and lateral conceptacles in combination with straight medullary filaments. It appears to be most closely related to Serraticardia and Bossiella. From these two genera it differs in conceptacle placement; they are axial and lateral in the former and solely lateral in the latter. It differs strikingly from Alatocladia and Calliarthron in that these two genera have interlaced medullary filaments.

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Contributors
Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in CD format. These AlgaeBase descriptions are now being continually updated, and each current contributor is identified above. The PSA and AlgaeBase warmly acknowledge the generosity of all past and present contributors and particularly the work of Dr Parker.

Descriptions of chrysophyte genera were subsequently published in J. Kristiansen & H.R. Preisig (eds.). 2001. Encyclopedia of Chrysophyte Genera. Bibliotheca Phycologica 110: 1-260.

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Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 01 September 2013. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 22 November 2024