Alatocladia (Yendo) H.W.Johansen, 1969

Holotype species: Alatocladia modesta (Yendo) H.W.Johansen

Original publication and holotype designation: Johansen, H.W. (1969). Morphology and systematics of coralline algae with special reference to Calliarthron. University of California Publications in Botany 49: [i]-vi, 1-98, 33 figs, 2 tables, incl. 19 plates.

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Description: Thalli with holdfasts bearing one to several erect, pinnately branched, articulated fronds. Fronds of calcified, flat intergenicula separated by uncalcified genicula. Intergenicula of arching tiers of interlaced 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 of single tiers of long, straight, unbranched cells uncalcified except where they project into neighboring intergenicula. Trichocytes unknown. Reproductive cells forming within conceptacles originating in medullary meristems at or near branch apices. Except in male plants conceptacles occasionally bearing surmounting branches. Conceptacle pores usually subapical. Tetrasporangial conceptacles with paraphyses and containing >30 mature tetrasporangia prior to spore discharge. Sexual plants dioecious. Pore of each spermatangial conceptacle opening at tip of beak projecting from roof. Carpogonial conceptacles with extensive layer of supporting cells with carpogonial filaments. Carposporangial conceptacles containing broad, thin fusion cells with gonimoblast filaments arising from margins and upper surfaces. Spores germinating into crustose sporelings by the Corallina-type of spore germination.

Information contributed by: H.W. Johansen. The most recent alteration to this page was made on 2015-12-29 by Paul Gabrielson.

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

Gender: This genus name is currently treated as feminine.

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: Alatocladia modesta occurs in Japan from Hokkaido to southern Japan, Korea, and Kamchatka; A. yessoensis is endemic to Japan. Despite sharing the character of interwoven medullary filaments Alatocladia and Calliarthron are not supported as sister taxa based on rbcL sequence data. The former differs from the latter in having paraphyses in tetrasporangial conceptacles.

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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. 29 December 2015. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 23 September 2023

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