Spore Morphology of Indian Ferns I. Aspidiaceae

Nayar, B. K.; Devi, Santha

doi:10.1080/00173136409429131

Cited by 40 publications

(16 citation statements)

References 4 publications

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“…The first exsicate listed in the "List of the Specimens Examined" is termed the reference specimen and the others are compared with this. The terminology is based on Nayar & Devi (1963) and Punt et al (1994).…”

Section: Methodsmentioning

confidence: 99%

Spore morphology of some Bruchiaceae species (Bryophyta) from Brazil

Luizi‐Ponzo

Barth

1998

Grana

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Section: Methodsmentioning

confidence: 99%

Spore morphology of some Bruchiaceae species (Bryophyta) from Brazil

Luizi‐Ponzo

Barth

1998

Grana

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“…The transition to the simply pinnate adult form of the leaf is more or less sudden, intermediary stages being few and infrequent as reported in B. knnarensis (Devi, 1963).…”

Section: J W E N I L E Sporophytesmentioning

confidence: 76%

Studies on the fern genera Bolbitis and Egenolfia

Nayar

Kaur

1965

Journal of the Linnean Society of London, Botany

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SUMMARY An account of the spore‐morphology, development and structure of the prothalli and morphology of the juvenile sporophytes of 19 spp. (12 of Bolhitis and 7 of Egenolfia) is given. The spores are monolete, with a smooth exine and enveloped by a granulose (rarely smooth) or reticulate perine which is characteristically folded. The average spore‐size is 22–34 32–40 22–34 μ. in Bolbitis, and 28–36 36–49 26–37μ in Egenolfia. On spore germination, a 3–6‐cells long filament is formed and develops into a prothallial plate by longitudinal divisions in the anterior cells. Generally an obconical apical meristematic cell is developed from one of the anterior marginal cells, either soon after plate formation or a little later. The anterior region of the thallus expands, later becoming cordate, and a multicellular meristem replaces the apical cell in the usual way. An apical cell stage is sometimes omitted, more frequently in Egenolfia than in Bolbitis. A midrib is developed when the thalli are about 2 months old. Prothalli reach maturity in 6–8 months in most species (3–4 months in B. presliana). The mature prothallus is of the cordate type, with a tendency, in most species, to elongate slightly with age: the midrib is 6–8 cells thick and the wings are spread out. Collenchyma‐like thickenings of wing cells are found in some species of Bolbitis. The prothalli, in most species, are naked: towards maturity, sparse, marginal hairs are developed in B. heteroclita and B. presliana, and club‐shaped, marginal, multicellular hairs in B. semicordata, B. subcrenata and E. sinensis. The early juvenile leaves are simple with a lobed lamina and supplied by a solitary, vascular strand forked 2 or 3 times. A midrib is found from the 5th‐7th leaf onwards: the lamina is pinnately dissected and the venation is free and pinnate. As the size of the successive juvenile leaves increases, the lamina becomes bipinnate with small ultimate lobes. The protostelic vascular cylinder of the juvenile rhizome becomes dorsally grooved and later gutter‐like, with the leaves supplied by paired leaf traces originating from either margin of the gutter. Soon the vascular cylinder becomes siphonostelic by the margins of the gutter coming together, and later, the leaves are borne in 2 alternating rows as in the adult plants. The leaves on the siphonostelic rhizome are markedly larger and simply pinnate as in the adult plants, the transition being rather sudden. Branching associated with leaf insertions occurs only after the simply pinnate condition is attained. Unicellular papillate hairs are found on the lamina of all the juvenile leaves. Uniseriate club‐like hairs are found towards the bases of the earlier leaves, and later, spread over the main veins. Large acicular hairs are found on the lamina from the 3rd or 4th juvenile leaf onwards, and persist till the adult simply pinnate form is attained. Bolbitis and Egenolfia are closely related genera, allied to Elaphoglossum on the one hand and Lomariopsis and Teratophyllum on the other: the group appears to b...

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“…recognised by a host of fern systematists and morphologists among whom may be mentioned Bower (1923-28), Bir (1966-67), Copeland (1937), Devi (1966Devi ( , 1973Devi ( , 1974Devi ( , 1976, Devi et al (1971), Erdtman (19571, Erdtman & Sorsa (19711, Harris (1953, Knobloch (1969, Knox (1938). Nayar (l964), Nayar & Devi (1963, 1966, 1968. Pal & Pal (1970), Selling (19461, Sladkov (1967.…”

Section: -mentioning

confidence: 99%

The Concept of Perispore—An Assessment

Devi

1980

Grana

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The TEhI observations of the perispore reveal: (I) The presence of the perispore in many families tvhich were earlier considered non-perinate. However. this perispore differs in nature from the Lhl-detected layer. (2) The conventional perispore is double layered with septa running in between the two, and may be acetolysis-resistant, acetolysis-affected or acetolysis-soluble. (3) The so-called loose perispore in Aspleniaceae and Aspidiaceae is the only Lhl-visible layer which gives the false impression of being loose. (4) It is fibrillar in nature, although it differs in certain genera. Although extra exosporial in nature, it is doubtful whether the equatorial collar in Preris-group of ferns, the elaters in Eqrriserrrrti and the proximal cuplike structures of the spore coat in Gleicheniaceae, have a distinct position in the line of evolution of perispore. Also, it is not yet definite whether the genetic control regarding the patterning of the perispore is passed through the apertural "fissures" in the developing exine.

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Spore Morphology of Indian Ferns I. Aspidiaceae

Cited by 40 publications

References 4 publications

Spore morphology of some Bruchiaceae species (Bryophyta) from Brazil

Spore morphology of some Bruchiaceae species (Bryophyta) from Brazil

Studies on the fern genera Bolbitis and Egenolfia

The Concept of Perispore—An Assessment

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