Calliarthron Manza, 1937

Holotype species: Calliarthron cheilosporioides Manza

Currently accepted name for the type species: Calliarthron cheilosporioides Manza

Original publication and holotype designation: Manza, A.V. (1937). The genera of the articulated corallines. Proceedings of the National Academy of Science of the United States of America 23: 44-48.

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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 medullary cells surrounded by a photosynthetic cortex and a unistratose layer of epithallial cells. Intergenicular medullary filaments interlaced, except sometimes near genicula. 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 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). Conceptacle pores central or excentric. Conceptacles lacking surmounting branches. Tetrasporangial conceptacles lacking paraphyses and containing >30 mature tetrasporangia prior to spore discharge. Bisporangia unknown. Sexual plants dioecious. Spermatangial conceptacles opening by pore at tip of beak projecting from roof. Spermatangial mother cells and spermatangia produced from densely packed layer of basal cells on floor and walls of conceptacle chamber. Carpogonial conceptacles with extensive layer of >200 supporting cells with carpogonial filaments. Carposporangial conceptacles containing broad, thin fusion cells with gonimoblast filaments arising from upper surface. Spores germinating into crustose sporelings by the Corallina-type of spore germination. Subsequent growth is into a slowly spreading crust from which fronds develop.

Information contributed by: H.W. Johansen. The most recent alteration to this page was made on 2011-06-09 by Paul Gabrielson.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

Most recent taxonomic treatment adopted: Schneider, C.W. & Wynne, M.J. (2007). A synoptic review of the classification of red algal genera a half a century after Kylin's "Die Gattungen der Rhodophyceen". Botanica Marina 50: 197-249.

Comments: Calliarthron contains robust plants which, in C. cheilosporioides, may be up to 30 cm tall. The two species are endemic and prominent in the northeast Pacific where they form luxuriant growths in deep tide pools, on shallow sublittoral rocks, and in kelp forests. Despite sharing the character of interlaced medullary filaments with Alatocladia, rbcL molecular sequence data does not support a sister taxon relationship with Calliarthron.

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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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Paul Gabrielson in Guiry, M.D. & Guiry, G.M. 09 June 2011. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 06 December 2022

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