Lithophyllum socotraense, Basso & Caragnano & Gall & Rodondi, 2015

Basso, Daniela, Caragnano, Annalisa, Gall, Line Le & Rodondi, Graziella, 2015, The genus Lithophyllum in the north-western Indian Ocean, with description of L. yemenense sp. nov., L. socotraense sp. nov., L. subplicatum comb. et stat. nov., and the resumed L. affine, L. kaiseri, and L. subreduncum (Rhodophyta, Corallinales), Phytotaxa 208 (3), pp. 183-200 : 193-195

publication ID

https://doi.org/ 10.11646/phytotaxa.208.3.1

DOI

https://doi.org/10.5281/zenodo.13642565

persistent identifier

https://treatment.plazi.org/id/03C43948-EC65-492F-B3C8-FE6BFB6B14BC

treatment provided by

Felipe

scientific name

Lithophyllum socotraense
status

sp. nov.

Lithophyllum socotraense sp. nov.

Figure 10 View FIGURE 10 ; Table 3

HOLOTYPE: sample DB635 (leg. Caragnano: Socotra, 15.iii.2010) including stub 09062010b6 and histological slide DB635- SO20 b, conserved in TRH ( TRH-A3881 ).

ETYMOLOGY: the specific epithet refers to the type locality, the island of Socotra, Yemen.

TYPE LOCALITY: Yemen, Indian Ocean, Ras Adho on the NE coast of Socotra Island, 22 m depth.

MATERIAL EXAMINED: Indian Ocean , NE Socotra Island: Rosh, 16 m, samples DB615-616 (leg. Caragnano: 12.iii.2010) ; Ras Adho , 22 m (the holotype) and 13 m (sample DB636 ) (leg. Caragnano: 16.iii.2010) .

HABITAT AND PHENOLOGY: plants unattached as rhodoliths, enveloping coral fragments at nucleus, at depth> 12 m.

GEOGRAPHIC DISTRIBUTION: L. socotraense nov. sp. is known only from the NW Indian Ocean, Socotra Island.

HABIT AND VEGETATIVE STRUCTURE: Plants non-endophytic, with warty to lumpy growth form. The protuberances have a smooth surface, up to about 5 mm long and about 3–6 mm wide ( Fig. 10A View FIGURE 10 ).

Plant structure pseudoparenchymatous ( Fig. 10B–C View FIGURE 10 ). Basal or ventral layer (= hypothallium) dimerous ( Fig. 10D View FIGURE 10 ). Hypothallial cells 15–18 μm long and 11–18 μm in diameter ( Tab. 3). Peripheral region (= perithallium) composed of filaments of cells curving outwards toward the thallus surface, 12–23 μm long and 10–13 μm in diameter ( Fig. 10C– D View FIGURE 10 ). Cells of adjacent filaments joined by secondary pit-connections, cell fusions not observed ( Fig. 10D–F View FIGURE 10 ). Palisade cells not observed. Single trichocytes 22–58 μm long and about 12–13 μm in diameter, abundantly distributed in the perithallium and at the thallus surface ( Fig. 10C, E View FIGURE 10 ). Single epithallial cells flattened, about 7–15 μm in diameter and 2–5 μm long ( Fig. 10F View FIGURE 10 ).

REPRODUCTION: Uniporate tetrasporangial conceptacle chambers protruding over the surrounding thallus surface, becoming buried in the thallus, 180–250 μm in diameter and 60–90 μm high, with pore-canal 45–60 μm long ( Fig. 10G–H View FIGURE 10 ; Tab. 3). Floor of the conceptacle chamber convex upward below a central columella. The conceptacle chamber floor is 9–11 cells below the thallus surface. Roof filaments 4–5 cells long, including the terminal epithallial cell ( Fig. 10H View FIGURE 10 ; Tab. 3). Gametangial and carposporangial conceptacles not found.

REPRESENTATIVE SEQUENCES: KP696790 (LSU), KP976402 (CO1) & KP976409 (psb A).

TRH

Norwegian University of Science and Technology - Herbarium

NE

University of New England

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