Antheridial Dehiscence in the Polypodiaceae

Hartman, Mátyás

doi:10.1086/334149

Cited by 19 publications

(13 citation statements)

References 5 publications

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“…to occur by a released cap cell that was thrown off. The structure and function of antheridia in different Polypodiaceae (sensu latu) was investigated by Hartman (1931). She described various mechanisms of dehiscence, similar to those mentioned above.…”

Section: Discussionmentioning

confidence: 99%

Scanning electron microscopy of gametophyte characters and antheridial opening in some Ceylonese species of Thelypteridaceae

Tigerschiöld

1989

Nordic Journal of Botany

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Gametophytes of the fern family Thelypteridaceae were cultivated aseptically under controlled conditions and investigated with the scanning electron microscope. This report concerns six species, viz. Sphaerostephanos arbuscula S. subtruncatus, S. unitus, Macrothelypteris torresiana, Amauropelta hakgalensis and Pneumatopteris truncata. The gametophytes have some features in common. They are more or less heart‐shaped and have glandular trichomes on surfaces and margins. In the middle is an elongated cushion bearing gametangia and rhizoids on the lower surface. Antheridia are of the type common to leptosporangiates, consisting of a basal cell, a ring cell and a cap cell. Archegonia consist externally of four rows of cells meeting at the top with triangular cells. The following features are distinguishing. The form of the margin of the thallus, type of hairiness, and the abundance of glandular hairs. Acicular hairs occur in Sphaerostephanos unitus and Pneumatopteris truncata. In Amauropelta hakgalensis the archegonium deviates from the common type in having a basal layer that consists of eight cells instead of four. In Macrothelypteris torresiana the four or three top cells are markedly irregular. In Sphaerostephanos arbuscula and Amauropelta hakgalensis the antheridial cap cell is sometimes divided. The manner of opening of antheridia and release of spermatozoids varies in each of the species investigated. This investigation reveals that it is possible to identify the species from gametophyte characters only.

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Section: Discussionmentioning

confidence: 99%

Scanning electron microscopy of gametophyte characters and antheridial opening in some Ceylonese species of Thelypteridaceae

Tigerschiöld

1989

Nordic Journal of Botany

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“…The outer wall of the cap cell becomes quite thick (0.7 J.Lm), and Lloyd (1971) observed waxy material on the surface of Onoclea antheridia, especially along the outer surface of the cap cell. Eames (1936) and Hartman (1931) reported that the cap cell in Onoclea antheridia is removed intact during dehiscence as opposed to being ruptured. SEM micrographs in this study confirm their observations.…”

Section: Discussion-division Phase -mentioning

confidence: 99%

“…The dehiscence of sperm from Onoclea antheridia was reported to occur after the cap cell was removed intact (Eames, 1936;Hartman, 1931). More recently, Nayar and Kaur (1971) claimed that the cap cell collapses in Onoclea to allow the release of the sperm.…”

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confidence: 99%

Spermatogenesis in a Homosporous Fern, Onoclea Sensibilis

Kotenko

1990

American J of Botany

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A detailed study of spermatogenesis in a homosporous fern, Onoclea sensibilis L., is presented from the formation of the first spermatogenous cell to the release of the sperm. Two different walls are deposited around the developing spermatids at specific developmental stages as opposed to one wall reported for other species. Most ultrastructural changes that occur in Onoclea during spermatid differentiation resemble those described in previous studies on other fern species, with the following exceptions: 1) A previously undescribed structure appears during midspermatid stage. This dense layer of amorphous material with a row of evenly spaced light areas occurs between the anterior portion of the mitochondrion associated with the multilayered structure and the anterior plasmalemma of the spermatid. 2) An early stage in blepharoplast formation resembles that which occurs in the heterosporous fern Marsilea, in contrast to that which has been reported in Platyzoma, the only other homosporous fern studied at this stage. 3) The osmiophilic crest does not form as early as reported in other ferns. 4) The cap cell of Onoclea is removed intact, rather than collapsing or forming a pore during sperm release. Observations are reported on the number of sperm per antheridium, the time course of spermatogenous cell mitosis, and of differentiation of spermatids into sperm. In Onoclea, an antheridium may contain either 32 or 64 sperm. Regardless of the final number of sperm, each has approximately the same volume.

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“…HARTMANN (4) said that the opening of an antheridium is caused by the swelling of the spermatogenous mass.…”

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confidence: 99%