Colura acroloba (Prantl) Jovet-Ast

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 : 112-114

Colura acroloba (Prantl) Jovet-Ast

( Figs 1 A-P; 8A)

Revue Bryologique et Lichénologique 22: 297 (1953).

SPECIMENS EXAMINED. — India. Arunachal Pradesh, Tirap district Khonsa, II.1982, K.P. Singh s.n. (ASSAM); Mizoram, Lawngtlai, Ngengpui WLS, 22°29’49.7’’N, 92°46’33.1”E, 138 m, 01.XII.2012, S. K. Singh & Party 127584M; Ngengpui Wildlife Sanctuary, 22°29’52.2’’N, 92°45’49.1’’E, 134 m, 02.XII.2012, S. K.Singh & Party 127670A (ASSAM); Ngengpui Wildlife Sanctuary, 22°29’50.4’’N, 92°45’34.6’’E, 146 m, 02.XII.2012, S. K. Singh & Party 127680A (ASSAM); Ngengpui WLS, 22°29’29.9’’N, 92°45’22.5’’E, 170 m, 02.XII.2012, S. K. Singh & Party 127692C (ASSAM); Tripura, Jampui Hills, Longai river side, 23°50’48.9’’N, 91°57’44.7’’E, 470 m, 26.X.2015, S. Kumar TSLI-1315B, 1327C (ASSAM).

HABITAT. — Foliicolous, growing in association with Caudalejeunea lehmanniana , Cheilolejeunea trapezia , Cololejeunea floccosa , C. subfloccsa , Drepanolejeunea devendrae , D. foliicola , Lejeunea exilis , Leptolejeunea balansae , L. latifolia , L. maculata , L. epiphylla , Microlejeunea punctiformis , in relatively less moist places at elevation of 100-200 m a.s.l.

DISTRIBUTION. — India [Andaman & Nicobar Islands, Mizoram-present study, Arunachal Pradesh-present study, Tripura ( Singh et al. 2016)], Cambodia, China, Fiji, Indonesia, Malaysia, New Caledonia, Papua New Guinea, Philippines, Samoa, Sri Lanka, Taiwan, Thailand, Vietnam, Australia ( Tixier 1979, 1980; Grolle & Piippo 1984; Tan & Engel 1986; Piippo 1990; Zhu & So 2001; McCarthy 2006; Lai et al. 2008; Söderström et al. 2010; Söderström et al. 2011; Chuah-Petiot 2011; Thouvenot et al. 2011; Wang et al. 2011; Long & Rubasinghe 2014; Bakalin & Van Sinh 2016).

A B E F C D H I J G K O L P M N

DESCRIPTION

Plants

Light green when fresh, pale yellowish in herbarium; shoots 5-9 mm long, 1.7-2.2 mm wide including leaves, irregularly branched.

Stem

In cross section suborbicular in outline, 62.5-85.0 µm, 4 cells across the diameter; cortical cells 7, subquadrangular, 17.5- 27.5 × 12.5-25.0 µm; medullary cells 3, rectangular-polygonal, 12.5-20.0 × 10.0-15.0 µm; ventral merophyte 1-2 cells wide. Rhizoids numerous, fasciculate at base of underleaves.

Leaves

Contiguous-distant, obliquely-widely spreading; leaf lobes oblong-obovate, 0.8-1.1 mm long, 0.48-0.68 mm wide, dorsal margin arched, ventral margin straight except near apex, margin entire; marginal leaf cells towards apex subquadraterectangular, 15.0-32.5 × 12.5-20.0 µm; median leaf cells hexagonal-polygonal, 20.0-35.0 × 15.0-25.0 µm; basal leaf cells slightly elongated, hexagonal-polygonal, 30.0-55.0 × 15.0-35.0 µm; cells with cordate-nodulose trigones, intermediate thickenings 1-2 per cell wall; cuticle smooth; leaf lobules tubular, as long as lobe, slightly wider toward sac, lateral margin usually incurved, sac small inflated at middle, rounded at apex, margin entire, surface smooth, valve elliptical-ligulate, 110.0-127.5 × 75.0-82.5 µm, with 11-15 median cells surrounded by a ring of 20-25 hyaline cells.

Underleaves

Distant, 3-4 times as wide as stem, 0.21-0.26 mm long, 0.21- 0.36 mm wide, deeply bilobed, sinus wide, lobes subulate, 7-10 cells long, 3-4 cells wide at base, margin entire.

Gemmae

Present on the leaf lobe, discoid, 72.5-82.5 × 85.0-95.0 µm with 3 adhesive cells.

Androecia and gynoecia

Not seen.