Peyssonneliopsis Setchell & Lawson, 1905

Holotype species: Peyssonneliopsis epiphytica Setchell & Lawson

Original publication and holotype designation: Setchell, W.A. (1905). Parasitic Florideae of California. Nuova Notarisia 16: 59-63.

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Description: Parasitic, forming small dark red pustules, scattered over the surface of membranaceous Rhodphyceae, sending rhizoidal filaments deep into the tissues of the host-plant. Fronds composed of three sets of filaments: 1) Rhizoidal filaments slender, sparingly branched, penetrating into the central tissues of the host-plant; 2) Horizontal filaments radiating, septate, sparingly branched, and forming a basal layer a single cell thick; 3) Vertical filaments, arising from the cells of the basal layer, simple, several cells high with the cells longer than broad. Tetrasporangia elongated, arising from the basal cell of a vertical filament, transversely septate (zonate), not projecting beyond the tips of the vertical filaments. Antheridia and cystocarps unknown. A genus differing from Cruoria Fries, only in its parasitic habit and consequent possession of rhizoidal filaments penetrating the host-plant.

The most recent alteration to this page was made on 2016-08-17 by M.D. Guiry.

Taxonomic status: The taxonomic or nomenclatural status (or both) of this entity is in some way unresolved and requires further investigation.

Most recent taxonomic treatment adopted: Kylin, H. (1941). Californische Rhodophyceen. Acta Universitatis Lundensis 37(2): 1-51, 7 figs, 13 plates.

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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=43179

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 17 August 2016. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 29 December 2024