Pneophyllum Kützing, 1843

Holotype species: Pneophyllum fragile Kützing

Original publication and holotype designation: Kützing, F.T. (1843). Phycologia generalis oder Anatomie, Physiologie und Systemkunde der Tange. Mit 80 farbig gedruckten Tafeln, gezeichnet und gravirt vom Verfasser. pp. [part 1]: [i]-xxxii, [1]-142, [part 2:] 143-458, 1, err.], pls 1-80. Leipzig: F.A. Brockhaus.

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Description: Thalli comprising thin crusts <200 µm thick and up to 2-3 (-5) cells thick in vegetative parts; some entities consisting of unconsolidated filaments (e.g. P. confervicola f. minutulum). Epilithic or epiphytic on algae and seagrasses; adhering firmly by cell adhesion, lacking haustoria. Each spore germinating into an 8-celled sporeling from which the remainder of thallus is derived. Organized into two orders of filaments (dimerous), first-order filaments (primigenous filaments) producing a unistratose layer on a substrate and second-order filaments (postigenous filaments) growing from the first and oriented about at right angles to the substrate. Stratified elongate cells (palisade cells) lacking. Second-order filaments sometimes consisting only of single small epithallial cells (in which case thallus is only two cells thick). Outermost walls of epithallial cells rounded or flattened, not flared. Cells in contiguous filaments sometimes joined by fusions; secondary pit-connections lacking. Trichocytes sometimes present singly or in groups; intercalary within first-order filaments and sometimes also terminating second-order filaments. Reproductive cells forming within protruding uniporate conceptacles. Bisporangia sometimes present instead of tetrasporangia. Columella present or absent. Apical sporangial plugs absent. Gametangia poorly known.

Information contributed by: H.W. Johansen & M.D. Guiry. The most recent alteration to this page was made on 2022-04-08 by M.D. Guiry.

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

Gender: This genus name is currently treated as neuter.

Most recent taxonomic treatment adopted: Caragnano, A., Foetisch, A., Maneveldt, G.W., Millet, L., Liu, L.C., Lin, S.M., Rodondi, G. & Payri, C.E. (2018). Revision of Corallinaceae (Corallinales, Rhodophyta): recognizing Dawsoniolithon gen. nov., Parvicellularium gen. nov. and Chamberlainoideae subfam. nov. containing Chamberlainium gen. nov. and Pneophyllum. Journal of Phycology 54(3): 391-409.

Comments: Pneophyllum is segregated from Fosliella and Spongites by the 8-celled sporeling and by trichocytes that are intercalary in first-order filaments. However, studies are needed to verify the discreteness of these genera, and additional data may come from studies of reproductive features. Virtually all marine species except for a single species, Pneophyllum cetinaense, known from freshwaters in a unique karst watershed near the marine environment.

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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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M.D. Guiry in Guiry, M.D. & Guiry, G.M. 08 April 2022. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 01 October 2022

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