Leptolejeunea arunachalensis (Lejeuneaceae, Hepaticae) - a New Species from India

2008·2.1 MB·English

by  Sudipa Das

植物研究雑誌 343
J.Jpn.Bot.
83:343–346(2008)
Leptolejeunea arunachalensis (Lejeuneaceae, Hepaticae)
a New Species from India
Sudipa DASa and Devendra Kumar SINGHb
aBotanicalSurveyofIndia,CentralNationalHerbarium,Howrah,711103INDIA;
E-mail:[email protected]
bBotanicalSurveyofIndia,CGOComplex,3rdMSOBuilding,BlockF(5thfloor),
SaltLakeSectorI,Kolkata,700064INDIA
(ReceivedonJune16,2008)
A new species Leptolejeunea arunachalensis Sudipa Das & D. K. Singh, is de-
scribed from Mehao Wildlife Sanctuary, Arunachal Pradesh in Eastern Himalaya, India.
The new species is different from L. elliptica (Lehm. & Lindenb.) Steph. in having
smaller,3–5mmlongplants,closelyimbricateleaves0.16–0.34(cid:1)0.13–0.29mminsize
with only two ocelli and underleaves with parallel to subparallel, uniformly 2-celled
uniseriate lobes.
Key words: Arunachal Pradesh, India, Leptolejeunea arunachalensis, new species.
The genus Leptolejeunea (Spruce) Leptolejeunea arunachalensis Sudipa
Schiffn. is represented in India by eight Das & D. K. Singh, sp. nov. [Figs. 1–16]
species (Singh et al. 2006). Of these, five Leptolejeuneae ellipticae (Lehm. &
species viz., L. elliptica (Lehm. & Lindenb.) Lindenb.) Steph. affinis, sed plantis
Steph., L. foliicola Steph., L. latifolia minutissimis, 3–5 mm longis, 0.3–0.5 mm
Herzog, L. sikkimensis Udar & Awasthi and latis; foliis brevioribus, arte imbricatis ad
L. subdentata Schiffn. ex Herzog occur in contiguis, 0.16–0.34 (cid:1)0.13–0.29 mm, apice
the Eastern Himalayan region, while L. obtusis ad anguste rotundis; primo-dentibus
balansae Steph., L. epiphylla (Mitt.) Steph. obtusis ad subobtusis 1(–2)-cellulo-longis;
and L. maculata (Mitt.) Steph. occur in the ocellis unis uterque in basem et medium (vel
AndamanandNicobarIslands(Herzog1942, interdum in uterque basem), 2-cellularibus,
1950, Awasthi 1986, Daniels and Daniel uniseriatis, obtusis; lobis folio-inferiorum
2004, Singh et al. 2006). Leptolejeunea parallelis ad subparallelis differt.
balansae and L. elliptica also occur in the Type: INDIA: Eastern Himalaya,
Western Ghats region of the country Arunachal Pradesh, Lower Dibang Valley
(Awasthi 1986, Daniels and Daniel 2004). district,MehaoWildlifeSanctuary,Ijuno,ca.
During the course of study on Hepaticae and 950 m, 29 Nov. 2000, D. K. Singh 98485
Anthocerotae of Mehao Wildlife Sanctuary (holotype–CAL; isotype–BSD).
in Arunachal Pradesh, Eastern Himalaya, Plants yellowish green in herbarium,
India, the authors came across a hitherto closely appressed to the substratum or par-
undescribed species of the genus. The same tially ascending, minute, 3–5 mm long, 0.3–
has been described and illustrated in the pre- 0.5 mm wide with leaves, irregularly
sent communication. pinnately branched; branching Lejeunea
type. Stem delicate, in transverse section
—343—
344 植物研究雑誌 第83巻 第6号 平成20年12月
Figs. 1–16. Leptolejeunea arunachalensis Sudipa Das & D. K. Singh, sp. nov. 1. Plant in ventral view.
2–3. T. S. of stem. 4–9. Leaves. 10. Apical cells of leaf lobe. 11. Middle cells of leaf lobe, showing
median ocellus. 12. Basal cells of leaf lobe, showing basal ocellus. 13–14. Leaf lobules. 15–16.
Underleaves.
December2008 JournalofJapaneseBotanyVol.83No.6 345
Table1. Comparativemorphologicalaccountof Leptolejeuneaarunachalensis anditsalliedspecies
Characters L.elliptica L.arunachalensis
Plantsize 5–16mmlong,0.5–0.7(–0.9)mmwide very minute, 3–5 mm long, 0.3–0.5 mm
wide
Leaflobe contiguous to distant, 0.4–0.5 (cid:1)0.16–0.32 closely imbricate, 0.16–0.34 (cid:1)0.13–0.29
mm,apexsubacute,acutetoapiculate mm, apex obtuse to narrowly rounded, very
rarelysubacute
Leaflobule firsttooth1celllong firsttooth1–2cellslong
Ocellus ocelli3–5(15)perleaf,scatteredtype ocelli (1–)2, 1 basal, 1 middle; sometimes
onlybasalocelluspresent
Underleaf lobes strongly divergent, lanceolate, uni- lobes parallel to subparallel, obtuse, blunt,
seriate,(2–)3–4cellslong,biseriateatbase uniseriate,2-celledthroughout
orbicular to suborbicular in outline, 60–70 subacute, hyaline papilla present at its proxi-
mm across diameter; cortical cells in 6–7 mal end; second tooth reduced, obsolete.
vertical rows, quadrangular, 12–26 (cid:1)18–24 Underleaves distant, attachment with stem
µm, thin walled; medullary cells 3 in num- straight, quadrangular, 0.07–0.1 (cid:1)0.07–0.08
ber, polygonal to sub quadrate, 8–10 (cid:1)6–8 mm, slightly wider than stem, bilobed; lobes
µm, thin walled; ventral merophytes of stem subparallel to almost parallel, obtuse, 2 cells
2cellswide.Leavesimbricatetocontiguous, long, uniseriate throughout; apical cells fre-
distant towards base of plants and at quently brown; lamina rectangular, encircled
branches, alternate, incubous, spreading by (4–)6 rectangular to polygonal marginal
from stem at an angle of 50–60°; lobes cells. Rhizoids infrequent, rarely arising
ovate, rarely oblong-obovate, 0.16–0.34 (cid:1) from basal disc of underleaves. Fertile plants
0.13–0.30 mm, apex obtuse to narrowly not seen.
rounded, rarely subacute; margins entire; Habitat and ecology: Epiphytic, growing
dorsal margin arched; ventral margin more at the base of Amomum subulatum in ex-
or less straight, slightly wavy; cells thin tremely shady condition.
walled, with small, triangular trigones, inter- Leptolejeunea arunachalensis is charac-
mediate thickenings 1–2 per wall, usually terized by minute plants attaining a length of
nodulose;apical-marginalleaf-lobecellsrec- 3–5 mm with imbricate to contiguous leaves
tangular to quadrate, 14–22 (cid:1)16–24 µm, (Figs. 4–9); ovate to rarely oblong-obovate
median leaf-lobe cells more or less iso- leaf lobes with obtuse to narrowly rounded
diametric, 24–34 (cid:1)20–32 µm, basal leaf- or rarely subacute apex and entire margin
lobe cells more or less isodiametric to (Fig. 10); presence of only 2 or rarely 1
slightly elongated, 24–36 (cid:1)20–30 µm, vitta ocellus per leaf with large, oval-elliptic basal
cells absent; cuticle smooth; oil bodies not ocellus (Fig. 12); oblong-ovate leaf lobules,
seen; ocelli 1–2 per leaf lobe; basal ocellus 1/3–1/2 of lobe length with 1(–2)-celled first
large, oval-elliptic, hyaline, 60–68 (cid:1)36–40 tooth and obsolete second tooth (Figs. 13–
µm, median ocellus globose, hyaline, 36– 14) and distant, quadrangular underleaves
38 µm in diameter, sometimes only single with2cellsuniseriate,paralleltosubparallel,
basal ocellus present; leaf lobule oblong- obtuse lobes (Figs. 15–16).
ovate,0.07–0.15(cid:1)0.03–0.09mm,1/3–1/2of Leptolejeunea arunachalensis resembles
thelobelength,inflated,apexobliquelytrun- L. elliptica in the shape of leaves and leaf
cate; first tooth 1(–2) cells long, obtuse to lobe and lobule ratio. But the former can be
346 植物研究雑誌 第83巻 第6号 平成20年12月
easilydistinguishedfromthelatterinarange References
of other morphological features as summa- AwasthiU.S.1986.ThegenusLeptolejeunea(Spruce)
rized in Table 1. Steph.inIndia.J.Ind.Bot.Soc. 65:117–123.
Daniels A. E. D. and Daniel P. 2004. Leptolejeunea
balansae Steph. (Hepaticae: Jungermanniales) – a
The authors are thankful to the Director,
newrecordofbryoflorafromtheIndianmainland.
Botanical Survey of India for facilities and
J.BombayNat.Hist.Soc. 101:333–334.
encouragement, the Chief Wildlife Warden, Herzog T. 1942. Revision der Lebermoosgattung
ArunachalPradeshForestDepartmentforfa- Leptolejeunea Spr. in der Indomalaya. Flora 135:
cilitating the exploration work inside the 377–434.
Herzog T. 1950. Miscellanea bryologica II. Palaeo-
sanctuary, and to Dr. V. J. Nair, Scientist
tropica.Mem.Soc.FaunaFloraFenn. 26:37–66.
Emeritus, Southern Circle, BSI, Coimbatore
Singh D. K., Das S. and Dey M. 2006. Leptolejeunea
for Latin rendering of the diagnosis. One of
subdentata Schiffn. ex Herzog (Hepaticae:
us (SD) is also grateful to the Director, BSI, Lejeuneaceae) new to India. Ind. J. Forest. 29 (3):
forfinancialassistanceunder‘FloraofIndia’ 339–342.
project.
S. ダスa, D.K. シンb：インド産苔類の 1 新種
Leptolejeuneaarunachalensis (Lejeuneaceae)
ヒマラヤ東部に位置するインドのアルナーチャ の葉あたり2個の眼点細胞をもつこと, 腹葉は2
ル・プラデーシュ州の採集品から苔類クサリゴケ 裂し, それぞれの裂片は1細胞幅, 2細胞長で,
科の新種LeptolejeuneaarunachalensisSudipaDas& 両者がほぼ平行になる点などで異なる.
D. K. Singhを記載, 図解した. 本種は熱帯に広く (aインド・植物調査所国立中央標本館,
分布するL. elliptica (Lehm. & Lindenb.) Steph.と bインド・植物調査所CGOコンプレックス)
は, 植物体がより小さく, 葉は密に重なり, 一枚