The " Martian " flora: new collections of vascular plants, lichens, fungi, algae, and cyanobacteria from the Mars Desert Research Station, Utah Author Sokoloff, Paul C. Author Freebury, Colin E. Author Hamilton, Paul B. Author Saarela, Jeffery M. text Biodiversity Data Journal 2016 4 8176 8176 http://dx.doi.org/10.3897/BDJ.4.e8176 journal article http://dx.doi.org/10.3897/BDJ.4.e8176 1314-2828-4-8176 Trebouxia sp. 4 Trebouxia sp. 4 [T. cf. usneae (Hildreth & Ahm.) Gaertner / T. cf. potteri Ahm. ex. Gaertner ] Materials Type status: Other material . Occurrence: recordNumber: 290; recordedBy: Sokoloff, Paul C. ; Taxon: kingdom: Plantae; phylum: Chlorophyta; class: Trebouxiophyceae; order: Trebouxiales; family: Trebouxiaceae; genus: Trebouxia; Location: continent: North America; country: United States of America ; countryCode: USA; stateProvince: Utah; county: Wayne County; municipality: Hanksville; locality: Mars Desert Research Station ; verbatimLocality: "Comm check" hill, 1.7 km north of Mars Desert Research Station, just west of Cow Dung Road; verbatimElevation: 1371 m ; verbatimLatitude: 38°25'3.15"N ; verbatimLongitude: 110°46'54.59"W ; coordinateUncertaintyInMeters: 50; Identification: identifiedBy: Hamilton, Paul B. ; dateIdentified: 2016; Event: verbatimEventDate: November 22, 2014 ; habitat: Sandstone at crest of Artemisia and Ephedra dominated hilltop; Record Level: institutionID: CMN; collectionID: CANA 117865; collectionCode: CANA ; basisOfRecord: Dried Specimen Notes Cells spherical to weakly elliptical, 12-15.0 μm in diameter (Fig. 4 e-f). Chloroplast lobed, covering most of the cell. One to many pyrenoids present, at times difficult to distinguish. In the natural population the cell wall sheath was thin <0.8 μm . Small colonies of daughter cells tightly packed in forming broad wedge-shaped colonies in spherical to elliptical clusters. Endolithic, scattered with Gloeocapsa sp. 0.1-0.4 mm below the sandstone surface.