Spirirestis rafaelensis V.R.Flechtner & J.R.
Spirirestis rafaelensis V.R.Flechtner & J.R.Johansen San Rafael Swell, south-central Utah, USA
© Valerie R. Flechtner
Spirirestis rafaelensis V.R.Flechtner & J.R.Johansen in V.R.Fletchner et al. 2002: 7, figs 1-7
Published in: Flechtner, V.R., Boyer, S.L., Johansen, J.R. & DeNoble, M.L. (2002). Spirirestis rafaelensis gen. et sp. nov. (Cyanophyceae), a new cyanobacterial genus from arid soils. Nova Hedwigia 74: 1-24.
This is the type species (holotype) of the genus Spirirestis.
Status of name
This name is of an entity that is currently accepted taxonomically.
No synonyms are currently included in AlgaeBase.
This is a terrestrial species.
Colony softly mounded on agar, with slightly irregular margins, not tufted, dark blue-green, maintaining its colour at four months; the only evidence of colour change to olive or ochre occurring with cell death in drying, older cultures. Colony compact, with densely arranged filaments, but no evidence of external mucilage production. Although filaments can be seen within the colony at 30 x magnification, filaments do not extend horizontally or vertically from the colony. Colony morphology is similar on both Bolds Basal and Z-8 media.
Filaments forming tight, regular spirals which can be seen to taper slightly in young cultures. Filaments 6-20 µm in diameter; spirals 16-28 µm in diameter at their widest point, tapered end of spirals about 75-80% of the maximum diameter; distance between regular spirals 8-12(-16) µm. Some filaments more loosely coiled, or even extended; these filaments increasing in frequency in older cultures. Both single and double false branching occasionally observed in more loosely coiled or extended filaments, but not in tightly spiraled filaments. False branching usually distant from the heterocytes. Sheath firm, usually colourless, occasionally golden to brown, thin in young cultures becoming thicker and lamellated in older cultures, 1-4 µm thick. Trichomes not to slightly constricted at the crosswalls, more commonly constricted in older cultures and in loosely coiled or extended filaments, 5.5-14.0 µm in diameter.
Cells mostly shorter than wide, occasionally quadratic, 2.0-7.2 µm long, without aerotopes, cell contents sometimes granular, especially in older cultures. Heterocytes both intercalary and basal within filaments, mostly single but occasionally double in intercalary position, rarely triple, spherical to oval, sometimes appressed on one side in basal position, light brown, 8-9 m in diameter, 4-9 µm long.
Type locality: USA: Utah: San Rafael Swell, Emery County (39°06.066'N, 110°44.713'W) (19.v.1995) (Flechtner et al. 2002: 7). Holotype: 19.v.1995; BRY C35162 (Flechtner et al. 2002: 7). Notes: Type culture: UTEX 2660
Komárek, J. (2013). Süsswasserflora von Mitteleuropa. Cyanoprokaryota: 3rd part: heterocystous genera. Vol. 19 pp. [i]-xviii, -1130. Heidelberg: Springer Spektrum.
Created: 17 July 2006 by M.D. Guiry
Verified by: 14 December 2017 by M.D. Guiry
Accesses: This record has been accessed by users 774 times since it was created.
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(Please note: only references with the binomials in the title are included. The information is from the Literature database.)
Flechtner, V.R., Boyer, S.L., Johansen, J.R. & DeNoble, M.L. (2002). Spirirestis rafaelensis gen. et sp. nov. (Cyanophyceae), a new cyanobacterial genus from arid soils. Nova Hedwigia 74: 1-24.
Linking to this page: http://www.algaebase.org/search/species/detail/?species_id=129285
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 24 March 2019.