Stomatochroon B.T.Palm, 1934

Holotype species: Stomatochroon lagerheimii B.T.Palm

Original publication and holotype designation: Palm, B.T. (1934). On parasitic and epiphyllous algae. II. Stomatochroon, a genus of stomaticolous Chroolepideae. Arkiv for Botanik 25: 1-16.

Description: Endophytic in plant leaves, often present on ventral side near drip tip. Externally visible thallus a single enlarged "central cell" comparable to pyriform head cell in Cephaleuros) emerging from host stomate. Central cell with few sterile trichomes and sporangiophores, each with one or more abscising zoosporangia. Within stomatal chamber, central cell connected to enlarged, lobed basal cell from which branches grow through intercellular spaces and produce additional plantlets at other stomates. Chloroplast parietal without pyrenoids. Nuclei in vegetative cells generally single, but occasionally double in young cells. Although ultrastructural studies limited, many morphological features, including abscising zoosporangia, similar to related genera. Cross walls likely contain plasmodesmata and zoosporangium-pedicel cross wall probably specialized. Asexual reproduction by zoospores with 8-16 spores in each sporangium. Zoospores and gametes typical of Trentepohliales (see Cephaleuros). Sexual reproduction isogamous and typical of order (see Cephaleuros) with biflagellate gametes released through pore-papillae as in other genera. Endophytic in plant leaves, often present on ventral side near drip tip. Externally visible thallus a single enlarged "central cell" comparable to pyriform head cell in Cephaleuros) emerging from host stomate. Central cell with few sterile trichomes and sporangiophores, each with one or more abscising zoosporangia. Within stomatal chamber, central cell connected to enlarged, lobed basal cell from which branches grow through intercellular spaces and produce additional plantlets at other stomates. Chloroplast parietal without pyrenoids. Nuclei in vegetative cells generally single, but occasionally double in young cells. Although ultrastructural studies limited, many morphological features, including abscising zoosporangia, similar to related genera. Cross walls likely contain plasmodesmata and zoosporangium-pedicel cross wall probably specialized. Asexual reproduction by zoospores with 8-16 spores in each sporangium. Zoospores and gametes typical of Trentepohliales (see Cephaleuros). Sexual reproduction isogamous and typical of order (see Cephaleuros) with biflagellate gametes released through pore-papillae as in other genera.

Information contributed by: R. L. Chapman. The most recent alteration to this page was made on 2014-02-25 by M.D. Guiry.

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

Most recent taxonomic treatment adopted: Liu, G.-X. & Hu, Z.-Y. (2013). New observations on a rare endobiotic green alga, Stomatochroon lagerheimii, from a tropical area in China. Nova Hedwigia 97(3-4): 429-436.

Comments: Widespread in tropical and subtropical regions. Three additional species described by Thompson but never published. As in other Trentepohliales, Stomatochroon accumulates cytoplasmic carotenoids and is orange-red. When abundant it blocks enough stomates to damage host leaf.

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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.

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Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 25 February 2014. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 29 November 2022

 
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