Bulbochaete thanguensis M. Mandal & D. Maity, 2018

Mandal, Manasi & Maity, Debabrata, 2018, Bulbochaete thanguensis (Oedogoniaceae), a new species from Sikkim Himalaya, India, Phytotaxa 346 (3), pp. 280-286 : 281

Bulbochaete thanguensis M. Mandal & D. Maity , sp. nov.

Nannandrous, gynandrosporous; androsporous cells11–12.5 μm in diam, 9–12 μm long; vegetative cells 7.5–12.5μm diam, 22–33.5μm long; basal cells 9–15.5 μm diam, 25–33 μm long; oogonium lateral, sometimes patent, oblongoid to slightly ellipsoid, situated below a terminal setae or vegetative cell, 19.7–26 μm diam, 39–43.7μm long, poriferous, pore superior; division of suffultory cell supreme; oospore oblongoid-elliosoid, 18.7–21.8 μm diam, 37.5–40.6 μm long; spore wall longitudinally costate; costae dentate, teeth of adjacent costae interconnected by transverse line; dwarf male usually on vegetative cell and sometimes on oogonium, 7.3–11 μm diam, 12.5–15.6 μm long; antheridia up to 4-seriate, exterior, 4–6.5 μm diam, 4–5.5 μm long; spermatozoids two, 2.5–3.5 μm diam, 2–3 μm long, division horizontal.

Holotype:— Sikkim, Thangu, Chopta valley , growing attached to the aquatic weeds, 27054/ 17 // N, 88031/ 27 // E, 4006 m a.s.l., 28 July 2015, Maity, Dey & Maiti 014-alg ( CUH). Slide # 6–11.

Iconotype:— Fig.1A .

Habitat:— Growing in marshy places of about 0.4 m in depth, attached to the aquatic weeds like Carex sp. , Potamogeton nodosus , etc. along with different species of filamentous green algae ( Oedogonium, Spirogyra, Zygnema ), desmids ( Closterium , Cosmarium , Euastrum , Micrasterias ) and blue green algae (Anabaen a, Gloeotrichia ) and other two Bulbochaete taxa, viz. Bulbochaete mirabilis Wittrock var. mirabilis f. immersa (Wittrock) Hirn and Bulbochaete pygmaea Pringsheim ex Hirn (Temp. 5–8° C, pH 7.2).

Distribution: — India: Himalaya: Sikkim. 4000–4100 m a.s.l.

Etymology: —The species epithet is derived from the name of the type locality Thangu valley, a place of North Sikkim.

Figures

FIGURE 1. Bulbochaete thanguensis sp. nov.: A. Habit (part); B. Basal cell (indicated by arrow); C. Dwarf male, note division of antheridial cells; D&E. Oospore, note ornamentation (suffultory cell division indicated by arrows); F. Oospore, note porate nature (indicated by arrow).