Porphyrosiphon latissimus Kaštovský, Fučíková & Bohunická, 2016

Kaštovský, Jan, Veselá, Jana, Bohunická, Markéta, Fučíková, Karolina, Štenclová, Lenka & Brewer-Carías, Charles, 2016, New and unusual species of cyanobacteria, diatoms and green algae, with a description of a new genus Ekerewekia gen. nov. (Chlorophyta) from the table mountain Churí-tepui, Chimantá Massif (Venezuela), Phytotaxa 247 (3), pp. 153-180 : 160

publication ID

https://doi.org/ 10.11646/phytotaxa.247.3.1

DOI

https://doi.org/10.5281/zenodo.13675703

persistent identifier

https://treatment.plazi.org/id/C04387E2-C518-FA7A-F9E6-FF66FDD04BAF

treatment provided by

Felipe

scientific name

Porphyrosiphon latissimus Kaštovský, Fučíková & Bohunická
status

sp. nov.

Porphyrosiphon latissimus Kaštovský, Fučíková & Bohunická , sp. nov. ( Fig. 4 View FIGURE 4 )

Cells approximately isodiametric, 4.5–6.0(7.0) μm wide, 3.5–5.5(7.0) μm long, barrel shaped, distinctly constricted at the cross walls, with granulated, yellow-brown content without aerotopes. Apical cells rounded, without calyptra, of the same dimensions as other cells in the filament ( Figs 4B, E, G View FIGURE 4 ). Sheath wide, distinctly lamellate, yellow to brown, widely open at the tip, considerably longer than the trichome ( Figs 4B, E–G View FIGURE 4 ). Filament, including the sheath, (25)30–40(50) μm wide. Generally one trichome per sheath, two in rare cases of pseudobranching ( Fig. 4F View FIGURE 4 ). Reproduction by disintegration of the ends of trichomes into one or more motile hormogonia ( Fig. 4C View FIGURE 4 ) with 8–22 cells. Necridic cells were not observed.

Type:— VENEZUELA. Bolívar State: Guyana Highlands, Chimantá Massif, Churí-tepui–Charles Brewer Cave Base Camp, Bathroom Creek canyon, above entrance into Charles Brewer Cave, 5º 14.952’ N, 62º 1.588’ W, 2200 m a.s.l., J. Kaštovský, 17 January 2012 (holotype: CBFS! A-020, Herbarium for Nonvascular Cryptogams at the Department of Botany, Faculty of Science, University of South Bohemia, České Budějovice, Czech Republic).

Etymology:— From the Latin adjective latissimus (widest), referring to the extraordinary width of the filament of the species.

Ecology and distribution:—This taxon occurred frequently on wet sandstone rocks, on top of Churí-tepui and Roraima, Venezuela. This species was observed in 10 % of the samples from Churí-tepui wet walls and previously also more frequently on Roraima (30 % of wet walls samples, identified as P. cf. notarisii, Kaštovský et al. 2011 ).

Comparison with similar taxa:— Generic characteristics (a single Phormidium -like trichome in wide lamellate and colored sheath, rarely two trichomes in a filament) correspond with the genus Porphyrosiphon , but the specimens from tepuis have a specific combination of relatively thin trichomes and the widest sheaths in the whole genus ( Table 3). All the known species having filaments with at least similar width to P. latissimus ( P. notarisii Kutzing ex Gomont (1892: 331) , P. notarisii var. major Gardner (1927: 41) and P. robustus Gardner (1927: 41 , 42)) have trichomes two- or more times wider and differ by color of the sheath. The trichome of the tepui-dwelling species is somewhat similar to trichomes of P. notarisii var. minor Li (1994: 70) from China, but that taxon has filaments half the size of P. latissimus (sheath of P. notarisii var. minor is significantly thinner, Tab. 3).

(according Komárek & Anagnostidis 2005).

CBFS

University of South Bohemia

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