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Three New Fern Fronds from the Glossopteris Flora of India

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Three New Fern Fronds from the Glossopteris Flora of India THREE NEW FERN FRONDS FROM THE GLOSSOPTERIS FLORA OF INDIA P. K. MAITHY Birbal Sahni Institute of Palaeobotany, Lucknow-226007 ABSTRACT of dates, Damudopteris becomes synonym A new species of Neomariopteris and a new to Neomariopteris, because the former form species of Dichotomopteris is recorded. In addition has been published one month later. to this a new genus Santhalea is instituted. INTRODUCTION Neomariopteris khanU sp. novo Diagnosis - Fronds large, at least tri• the ferns from the Lower Gondwanas knowledge on the morphology of pinnate; catadromic, rachis winged, secon• OURof India has been advanced consider• dary rachis broad, emerge alternately at an ably from the recent work of Maithy (1974a, angle of ± 60°; pinnae lanceolate; attached 1974b, 1975), Pant and Misra (1976) and alternate, sub-opposite or opposite from Pant and Khare (1974). Recently Maithy secondary rachis; lateral pinnules ovate, has revised the Lower Gondwana ferns from 1'0 cm long and 0'4 mm broad at base, i.e. India. On the basis of his revision, he has the length and breadth ratio of the pinnules instituted two new genera Neomariopteris is 2·5: I, lateral pinnules alternately and Dichotomopteris and an unrecorded form arranged, standing at right angles to rachis, Dizeugotheca. Pant and Khare (1974) and decurrent, attached by broad bases, lateral Pant and Misra (1976) have reported two fusion of two pinnules margin is ± 1/4 length new genera Damudopteris and Asansolia from of the pinnules from the base; apex acute; the Raniganj Coalfield. margin entire; both the margins show out• The present paper deals with three new ward curvature; terminal pinnules smaller fern fronds collected recently from than lateral pinnules, triangular in shape. Handappa, Dhenakal, Orissa and the village apex pointed; venation sphenopteroid, Tatti, on the north bank of Bansloi River, median vein distinct, emerge at 45° from Santhal Pargana, Bihar. The materials are the point where the lower margin of pin• preserved in the form of impressions. nules join the pinnae rachis, course straight, Sincere thanks are due to Dr K. R. median vein gives fine lateral nervules Surange and Dr Shaila Chandra for passing which dichotomises once before reaching on the Handappa collection for investiga• the margin, 10-12 nervules recorded in tion. one pinnule. Holotype-No. 35237, Birbal Sahni Insti• tute of Palaeobotany, Lucknow. Neomariopteris Maithy, 1974 Locality - Handappa, Orissa. Horizon - Kamthi Formation (Upper N eomariapteris waS proposed by Maithy Permian). (1974) for the Indian Lower Gondwana Description - A large incomplete frond fern fronds with sphenopteroid venation, has been figured in PI. I, fig. 1. The decurrent pinm,les and winged rachis. Sub• median rachis is thick, 7 mm at the in• sequently in 1975, Maithy recorded the complete base and 4 mm at the incomplete fertile pinnules and emended the diagnosis. apex. Surface of the rachis shows fine Pant and Khare (1974) published a new striations. The rachis is narrowly winged. genus Damudopteris with same morphologi• Secondary rachises are arranged alternately cal characters of N eomariopteris. Even both on both the sides of main rachis at a dis• the authors have chosen the same specimen, tance of 0·8 to 1·5 cm from apex to base. i.e. Sphenopteris poZymorpha IFeistmantel The distance in between alternating pair (1880), as the genotype for their proposed of secondary rachises decrease as we mea• genus. Therefore, on the basis of priority sure from base to apex of the frond. The 96 MAITHY _ THREE FERN FRONDS FROM GLOSSOPTERIS FLORA OF INDIA 97 TEXT-FIG. 1 - Neornariopteris khanii sp. nov., a pinnae enlarged to show venation of pinnules x 4. secondary rachises are attached at 60° on (1974)has obovate pinnule and N. talchirensis the main rachis. The basal most secondary Maithy (1974) is a frail species. rachis is 18 em long and 14 pinna are Derivation 0/ Name - The species is named arranged on it. Secondary rachis is dis• after late Mr A. M. Khan of Geological tinctly winged. Pinnae are attached, alter• Survey of India, Calcutta who first dis• nate to one other at the basal portion of covered this fossil locality. secondary rachis, sub-opposite in the median portion and opposite at the terminal portion or near it. Pinnae are attached at + 90° Santhalea gen. novo to secondary rachis, due to this a fairly Generic Diagnosis - Fronds large, impari• good distance (5'5-6'5 em) is observed in pinnate, tripinnate; rachis winged; pinnules between succeeding secondary rachises. decurrent, attached to rachis by broad base, Pinnae lanceolate in shape measuring 2-3·5 venation pecopteroid; single midvein per• em in length. Lateral pinnules 5 to 8 on either side of pinnae rachis. Later pinnules sistent up to apex, lateral veins towards apical part, simple, whereas in basal part are alternately arranged and attached divides into two, three or four veinlets; ± right angles to the rachis. The basal when three, the distal one divides into two margin of pinnules are longer drawn than and the proximal remains undivided, and the apical end of margin. As a result of when four the proximal remains undevided this th.e pinnules apex is oblique in position and in the distal one the proximal one to pinnae rachis. A midvein is persistent divides into two veinlets and distal one up to 1/3 from base which diffuses into remains unforked. R.eproductive structures secondary veins by dich.otomy. Margin unknown. of the pinnules entire. Terminal pinnule is triangular and smaller than the lateral pinnules. Fertile organs are not known. Genotype - Santhalea bansloiensis sp. novo Comparison - The frond is characterised by its large size and robust look, hence it Comparison - The identification of ferns differs from all the known species of from the Glossopteris flora are based upon Neomariopteris. Neomariopteris polymorpha the morphological characters and the pat• (Feistm.) Maith'y, 1974 compares due to tern of venation. Previous studies have strong winged rachis, but differs in the demonstrated that the ferns from the shape of pinnules, apex and right angle Lower Gondwanas, viz., Neomariopteris, alignment of pinnules. Neomariopteris Dichotomopteris and Dizeugotheca show a hughesii (Feistm.) Maithy, 1974 compares uniform type of venation in all pinnules. in the oblique alignment of pinnules to Similar uniformity in the pattern of vena• pinnae rachis, but differs in the presence of tion is also known in the modern ferns, extremely narrow winged rachis. Moreover, viz., Pteris, Goniophlebium, Gymnogramma in N. hughesii the pinnule margins are and Microlepia. There are other modern serrate. Other species, N. lobi/olia Maithy ferns where the pattern of venation varies 98 THE PALAEOBOTANIST in different pinnules. The veins are simple Diagnosis - Sterile fronds imparipinnate, in nature in the apical pinnules, while they tripinnate frond, rachis broadly winged, 5 are dichotomous once or more than once in mm broad with two distinct ridges; pinnae basal pinnules. Such type of venation is lanceolate, arranged alternately, at an angle seen in Diplazium, Lindsaea, Alsophila and of 450; pinnules attached to pinnae rachis Cyathea. The present frond Santhalea be• at wide angle, 80°-90°, contiguous to each longs to the second type and it shows other by base, cleft between pinnules deep, variation in the pattern of venation in oblong in shape with obtuse apex, midvein different pinnules from apex to base. But distinct and persistent upto apex, lateral this too is characteristic in the genus as veins arranged alternately; simple or divides detailed below. into 2, 3 or 4 veinlets; when 3, the proximal The frond of this genus is identified by one remains undivided and the distal one winged rachis and characteristic venation divides into 2; and when 4, the proximal pattern, which is from simple to dichoto• remains undivided, while the distal divided mous into 2, 3 or 4 veinlets. The dichotomy into two and lastly the vein of proximal. of veins is also characteristic. The present side divides into two and the distal one frond shows its closest resemblance to remains unforked. Pecopteris Brongniart, but it differs from Holotype - No. 35238, Birbal Sahni Insti~ Santhalea gen. novo in the absence of basal tute of Palaeobotany, Lucknow. contiguity of the pinnules and winged Locality - On the north bank of Bansloi rachis. Alethopteris Sternberg agrees due River near the village Tatti, Pachwara to basal contiguity of pinnules, but differs Coalfield, Santhal Pargana, Bihar. in the presence of veins from pinnae rachis Horizon -? Raniganj. in the basal region of pinnules. Dizeugo• Description - The identification of frond theca Archangelsky & Sota (1960) compares is based upon number of incomplete speci• morphologically but differs due to presence menS collected from the above mentioned of only simple veins. Dichotomopteris Maithy locality and the specimens described by (1974b) differs in the venation pattern. Maheshwari and Prakash (1965). The speci• In Dichotomopteris the mid vein is evane• men figured here in PI. 2, fig. 3 is a portion scent whereas in Santhalea it is persistent of bipinnate frond. The primary rachis is upto apex. Moreover the lateral veins in distinctly winged with two distinct vertical Dichotomopteris is always divided into 2 or ridges in the middle region. Veins in the 3 veinlets, whereas in Santhalea the veins pinnules present at the apical part of pinnae are simple and divided into 2, 3 or 4 vein• are simple and rarely dichotomous, whereas lets. Further, in Santhalea the rachis is the veins in the pinnules present in the basal winged whereas in Dichotomopteris the rachis part of fronds are either divided into two is non-winged. Lobatopteris Wagner (1958a) or three or four veinlets. All the variations and Polymorphopteris Wagner (1958b) com• of the venation patterns are seen in the pares somewhat morphologically, but dif• specimen figured by Maheshwari and fers in having the basal veins forked into Prakash (1965, pI.
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