157,517 species and infraspecific names are in the database, 22,209 images, 60,935 bibliographic items, 457,652 distributional records.

Stomatochroon B.T.Palm, 1934

Classification:
Empire Eukaryota
Kingdom Plantae
Subkingdom Viridiplantae
Infrakingdom Chlorophyta infrakingdom
Phylum Chlorophyta
Subphylum Chlorophytina
Class Ulvophyceae
Order Trentepohliales
Family Trentepohliaceae

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.

Taxonomic status: currently recognized as a distinct genus.

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.

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 25 Feb 2014 by M.D. Guiry.

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.

Numbers of names and species: There are 7 species names in the database at present, as well as 1 infraspecific names. Of the species names, 3 have been flagged as accepted taxonomically on the basis of the listed literature under the species name. In some instances, opinions on taxonomic validity differ from author to author and users are encouraged to form their own opinion. AlgaeBase is a work in progress and should not be regarded as a definitive source only as a guide to the literature..

Names: ('C' indicates a name that is accepted taxonomically; 'S' a homotypic or heterotypic synonym; 'U' indicates a name of uncertain taxonomic status, but which has been subjected to some verification nomenclaturally; 'P' indicates a preliminary AlgaeBase entry that has not been subjected to any kind of verification. For more information on a species click on it to activate a link to the Species database):

Click here to also show infraspecific names in the list below.

References
Brooks, F., Rindi, F., Suto, Y., Ohtani, S. & Green, M. (2015). The Trentepohliales (Ulvophyceae: Chlorophyta): an usual algal order and its novel plant pathogen, Cephaleuros. Plant Disease 99(6): 740-753.

Zhu, H., Hu, Z.Y. & Liu, G.X. (2017). Morphology and molecular phylogeny of Trentepohiales (Chlorophyta) from China. European Journal of Phycology 52(3): 330-341.

Verification of data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.

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.

Created: 16 April 2003 by M.D. Guiry

Verified by: 25 February 2014 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=46289

Citing AlgaeBase
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2020. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 16 February 2020.

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