Colura conica (Sande Lac.) K.I.Goebel

Singh, Sushil Kumar, Pócs, Tamás, Singh, Devendra & Kumar, Shashi, 2020, A synopsis of Colura (Dumort.) Dumort. (Marchantiophyta: Lejeuneaceae) in India, Cryptogamie, Bryologie 20 (10), pp. 111-129 : 116-118

Colura conica (Sande Lac.) K.I.Goebel ( Figs 3 A-S; 8D)

Annales du Jardin Botanique de Buitenzorg 39: 3 (1928).

SPECIMENS EXAMINED. — India. Arunachal Pradesh, Tirap, Namdapha National Park, II.1982, K. P. Singh s.n. (ASSAM); Mizoram, Lawngtlai, Ngengpui Wildlife Sanctuary, 22°29’49.7’’N, 92°46’33.1’’E, 138 m, 01.II.2012, S. K. Singh & Party 127633G, 127643A, 127644F (ASSAM); Tripura, North district, Jampui Hills, Longai river side, 23°50’48.9”N, 91°57’44.7”E, 470 m, 26.X.2015, S. Kumar TSLI-1315A (ASSAM).

HABITAT. — Foliicolous, growing in association with Cheilolejeunea ghatensis , Cololejeunea subfloccosa , Drepanolejeunea foliicola , Lejeunea anisophylla , L. exilis , Leptolejeunea balansae , L. epiphylla , Radula tjibodensis , in relatively less moist places at elevation up to 500 m a.s.l.

DISTRIBUTION. — India [Arunachal Pradesh, Mizoram-present study, Tripura ( Singh et al. 2016)], Bangladesh, Cambodia, China, Fiji, Indonesia, Laos, Vietnam, Malaysia, New Caledonia, Papua New Guinea, Philippines, Sri Lanka, Thailand, Vietnam, Australia ( Pócs et al. 1967; Tixier 1970, 1979; Grolle & Piippo 1984; Tan & Engel 1986; Zhu & So 2001; Banu-Fattah 2001 as Colura acutifolia ; McCarthy 2006; Lai et al. 2008; Söderström et al. 2010; Söderström et al. 2011; Chuah-Petiot 2011, also as Colura acutifolia ; Thouvenot et al. 2011; Long & Rubasinghe 2014; Bakalin & Van Sinh 2016).

DESCRIPTION

Plants

Pale green-yellowish green; shoots 5-11 mm long, 1.6-2.2 mm wide including leaves, irregularly branched.

Stem

In cross section suborbicular in outline, 75-107 µm, 4 cells across diameter; cortical cells 7, subquadrangular, (10.0-) 20-45.0 × (5.0-) 10.0- 37.0 µm; medullary cells 3, subquadrangular-polygonal, 15.0-25.0 × 7.5-17.5 µm; ventral merophyte 1-2 cells wide.

Rhizoids

Numerous, fasciculate, hyaline, at base of underleaf, rhizoidal disc absent.

Leaves

Imbricate-contiguous, obliquely-widely spreading; lobes obovate 0.60-1.05 mm long, 0.36-0.60 mm wide, dorsal margin strongly arched, serrate-serrulate, denticulations 1 cell long and wide at base, ventral margin nearly straight; marginal leaf cells quadrate-subquadrate, 17.5-37.5 × 12.5-27.5 µm; median leaf cells hexagonal-polygonal, 30.0-50.0 × 15.0- 22.5 µm; basal leaf cells slightly larger than median cells, hexagonal-polygonal, 32.5-57.5 × 10.0-25.0 µm; cells with cordate-nodulose trigones, intermediate thickenings frequent, 1-3 per cell wall; cuticle smooth; leaf lobules narrowly cylindrical, as long as leaf lobes, slightly flaring toward sac, free lateral margin usually strongly incurved, sac strongly inflated, large, ⅓ to almost as wide as leaf lobes, usually acute-acuminate or sometimes rounded to subacute at apex, entire or often denticulate owing to projecting cells at margin; valve ovate to short-ligulate, 85.0-105.0 × 80.0-87.5 µm, composed of 14-18 median cells surrounded by a ring of 16 hyaline cells.

Underleaves

Distant, transversely inserted to the stem, 0.19-0.26 mm long, 0.08-0.18 mm wide, 3-4 times as wide as stem, deeply bilobed, sinus U-V-shaped, lobes lanceolate, 7-8 cells long, 3-4 cells wide at base, margin entire.

Gemmae

Absent.

Androecia and gynoecia

Not seen.