Collinsiellopsis Chihara, 1967

Holotype species: Collinsiellopsis expansa Chihara

Original publication: Chihara, M. (1967). Collinsiellopsis, a new genus of green algae. Phycologia 6(2): 87-95.

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Description: Juvenile thalli disk-shaped, consisting of a packet of cells undergoing true vegetative cell division. Mature thalli indefinitely expanded, solid, firm and gelatinous. Cells near upper surface of frond pyriform or elliptical, more or less vertical, densely aggregated; in middle of frond pyriform, sometimes with rhizoid-like appendage; at lower surface pyriform to almost spherical. Cells uninucleate, each with a cup-shaped chloroplast, in most instances opening at lower part of cell, and with single pyrenoid. Cell wall with positive reaction to iodine-zinc chloride reagent. During reproductive, cells near upper surface differentiate into sporangia in which two or four zoospores formed. Asexual reproduction by anteriorly quadriflagellate zoospores. Zoospores markedly flattened, ovate when viewed from one side, lanceolate from opposite side, sometimes with papillate appendage at posterior end. Chloroplast of zoospores cup-shaped, with pyrenoid and stigma. In culture, zoospores produce plants similar to those collected in vivo. Method of sexual reproduction unknown.

Information contributed by: M. Chihara. The most recent alteration to this page was made on 2009-10-07 by Stephen Cusack.

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

Comments: Collinsiellopsis known only from marine habitats from Pacific coast of central Japan on rocks and pebbles in middle and upper littoral zones.

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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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.

Linking to this page: https://www.algaebase.org/search/genus/detail/?genus_id=42747

Citing AlgaeBase
Cite this record as:
Stephen Cusack in Guiry, M.D. & Guiry, G.M. 07 October 2009. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 23 April 2024