On the
identity and occurrence of Ophioglossum costatum (Pteridophyta:Ophioglossaceae) in Andhra Pradesh, India
Vatsavaya S. Raju1, A. Ragan 2, S. Suthari 3 &
M.V. Ramana 4
1-3 Plant SystematicsLaboratory, Department of Botany, KakatiyaUniversity, Warangal, Andhra Pradesh 506009, India
4 Department of Botany, OsmaniaUniversity, Hyderabad, Andhra Pradesh 500007, India
Email: 1satyavatsa@yahoo.co.in (corresponding author), 2 raganajmeera@yahoo.co.in, 3 sateeshsuthari@yahoo.com, 4 venkat.botany@gmail.com
Date
of publication (online): 26 January 2011
Date
of publication (print): 26 January 2011
ISSN
0974-7907 (online) | 0974-7893 (print)
Editor: P.B. Khare
Manuscript
details:
Ms # o2568
Received 10
September 2010
Finally
accepted 06 December 2010
Citation: Raju, V.S., A. Ragan,
S. Suthari & M.V. Ramana (2011). On the identity and
occurrence of Ophioglossum costatum (Pteridophyta: Ophioglossaceae) in Andhra Pradesh, India. Journal
of Threatened Taxa3(1): 1462-1464.
Copyright: © Vatsavaya S. Raju, A. Ragan, S. Suthari & M.V. Ramana2011. Creative Commons Attribution 3.0 UnportedLicense. JoTT allows unrestricted use of this
article in any medium for non-profit purposes, reproduction and distribution by
providing adequate credit to the authors and the source of publication.
Acknowledgement:MVR is obliged to Prof. B. Bhadraiah, Head and Research Supervisor, Department of
Botany, Osmania University, Hyderabad, for
encouragement.
Abbreviations: BSID - Herbarium of Deccan Circle, Botanical Survey of India,
Hyderabad; KUH - Kakatiya University Herbarium,
Warangal; SKU- Herbarium of Department of Botany, Sri Krishna DevarayaUniversity, Anantapur.
For image, table -- click here
The
members of the genus Ophioglossum L. (Ophioglossaceae) are known as
snake tongue or adder’s tongue ferns. The genus comprises, worldwide, an estimated 28-58 (Panigrahi& Dixit 1969) to 40 species (Singh et al. 2009). In India, it is represented by 12 species (Yadav & Tripathi 2002; Goswami et al. 2008; Singh et al. 2009). Pullaiah et
al. (2003) recorded three species of the genus for the state of Andhra Pradesh,
namely, Ophioglossum gramineum Willd., O.nudicaule L.f. and O. reticulatum L. However, earlier Rao et al. (1999) reported O. pedunculosum Desv. to be common on the hills of Tuniin East Godavari District which is synonymous with Ohioglossum costatum R.Br. - a distinct, widespread species
often misidentified with O.nudicaule L.f. The present paper attempts
to look at this problem and adds a note on the field identity and occurrence of
the paleotropical fern, Ophioglossum costatum R.Br., in Andhra Pradesh.
Taxonomic identity
In the
herbarium, often, the differences between the specimens of O. costatum and O. nudicaule are not perceived properly and
confused when the particulars of the subterranean parts such as rhizome shape,
size, number of fibrous roots, origin of trophophylls,
depth at which the rhizome is buried, presence of stolons,
etc. are missing or not indicated. Table 1 provides the differences between these species for their proper
identification.
Although
the sterile fronds arise from the subterranean part of the rhizome in O. costatum,O.nudicaule and O.polyphyllum, the plants attain a height of about 4cm, the rhizome is
tuberous, cylindrical with a growing point, stolonshelp in vegetative propagation, the angle between peduncle and lamina is 900and the venation of the sterile frond is not double in O. nudicaule. The plants can reach a height of 25cm, the rhizome is globose, tuberous with an apical cupule,
no stolons but bear profuse lateral roots and the trophophyll is with a distinct pale midrib in O. costatum, whereas, the sterile fronds are many
(2-5; usually 4) and without the distinct costa in O. polyphyllum.
Ophioglossum costatum
Ophioglossum costatum R.Br., Prodr.
Fl. Nov. Holl.: 163. 1810; Balakrishnan et al. in Bull.Bot. Surv. India 2: 337.1960; Panigrahi & Dixit in J. Indian Bot. Soc.
35: 249. f. 38, 39. 1969.
O. pedunculosum Desv., Mag. Ges. Nat.
Fr. Berlin 5: 306. 1811; Clausen in Mem. Torrey Bot. Club 19(2): 140. 1938.
O.pedunculatum Desv. ex Poir., Enc. Suppl. 4: 164. 1816 (error).
O. fibrosum Schumach. in Beskr. Guin. Pl.: 452. 1827; Bedd., Handb. Ferns Brit. India: 465. t.289.
1883; Mahabale in Bull. Bot. Surv. India 4: 71. 1962.
O.wightii Grev. et Hook., Bot. Misc. 3(8): 218. 1833.
O.brevipes Bedd., Ferns South. India: 23, t. 72. 1863.
O. bulbosum Bedd., Handb. FernsBrit. India,
Suppl.: 28. t.72. 1876, non Michx.
(1803), nom.illeg.
Diagnosis: Perennial herbs (geophyte)
of 13-19.7 cm high; rhizome tuberous, globose (Image
1d), 0.6 to 1 cm diam., with 37-54 lateral, fibrous, radiating or descending,
non-proliferous roots arising from the entire
periphery of the knob-like rhizome except at the bottom (Images 1c,e); stolons absent. Trophophylls(sterile fronds) 2 or 3, rarely 4 (even 5 c.f. Beddome,
loc. cit. ff. 72, 289) or single arising from a crater (pit-like depression);
3-7 x 1-3 cm, green with distinct pale midrib; usually flat, at times folded or
concave; ovate or ovate-lanceolate or elliptic,
slightly fleshy, broadly cuneate at base; apex acute
to obtuse; margin entire or wavy; standing at 40-600 from the
ground; trophophore 70–90% of its length
subterranean. Common stipe 0.8-1.8 cm; peduncle
9.1-14.4 cm, fertile segment (strobilus) arising above the middle of the stalk
[peduncle] (Images 1a,b); strobilus 1.2-2.9
cm (length) x 0.2-0.25 cm (diam.); green (Image 1f), yellowish when ripe (Image
1g); ratio of common stipe, peduncle and strobilus
1.0:7.5:1.5; sporangia 25-35 pairs per spike; length 0.75-1 mm, with no sterile
tip. Spores trilete.
Distribution: (a) Global: Tropical Africa,
Madagascar, India to Australia and New Zealand. (b) India: Chattisgarh,
Madhya Pradesh, Tamil Nadu (Balakrishnan et al.
1960); Uttar Pradesh, Bihar, West Bengal, Maharashtra and Kerala (Panigrahi & Dixit 1969); found in open grassy forest
floors, margins of ditches or hill slopes, next to rock boulders, etc.
ExSiccate: 13.vii.2010, Osmania University
campus, Hyderabad, Andhra Pradesh, India, (17025’57.7’’N & 78031’47.2’’E,
517m), V.S. Raju & M.V. Ramana, 001923 (BSID); 14.viii.2010, Pakhal Wildlife Sanctuary, Warangal District, (17057’41.5’’N
& 79059’00.7’’E, 256m altitude); V.S. Raju,
A. Ragan & S. Suthari, 1853 (KUH); 06.xii.2002, Chandragiri, Chittoor District,
P.A. Lakshmi, 26240 (SKU).
Note: (i) Plate 2 by Pullaiahet al. (2003) carry the picture of plants of Ophioglossum nudicaule from Chandragiri,Chittoor District whichclearly pertain to O.costatum. Prof. R.R.V. Raju (pers. comm.)
confirms the herbarium specimen cited above of the collector at SKU as of O. costatum; (ii) Pullaiahet al. (2003) also failed to record the presence of O. pedunculosum in TuniHills of East Godavari District of Andhra Pradesh reported by Rao et al. (1999); O. pedunculosum Desv. is now treated conspecific with O. costatum R.Br.; (iii) The specimens of O. costatum from Madhya Pradesh and Chattisgarh were found to be larger bearing long elliptic
leaves, etc. (Balakrishnan et al. 1960); (iv)
Although O.costatum is not in endangered list, its habitats are threatened due
to alien plant invasions (by Hyptis suaveolens, Parthenium hysterophorus,etc.), grazing (Image
1h), etc.
REFERENCES
Balakrishnan, N.P., K. Thothathri& A.N. Henry (1960). Some Indian Ophioglossums - taxonomy
and distribution. Bulletin
of the Botanical Survey of India2(3&4): 335-339.
Goswami,
H.K., S.C. Verma & B.D. Sharma (2008). Biology of Pteridophytes– I. Ophioglossum L. BionatureMonograph, Catholic Press Ranchi, Jharkhand-India, 135pp.
Panigrahi, G.
& R.D. Dixit (1969). Studies in Indian Pteridophytes.IV. The family Ophioglossaceae in India. Proceedings of the National
Institute of Sciences of India35B: 230-266.
Pullaiah,
T., A. Ahmed & P.A. Lakshmi (2003). Ophioglossum: pp. 38-42. In: Pteridophytes in Andhra Pradesh, India. Regency
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R.S., S. Sudhakar & P. Venkanna(1999). Flora
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