The Gametophyte of Cystodium

Atkinson, Lenette Rogers

doi:10.2307/1546431

Cited by 5 publications

(5 citation statements)

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“…Comparable perine fragility is evidenced in Cystodium (Fig. 5), a condition previously noted by Atkinson (1965). Beneath the perine, the exine is unsculptured (Fig.…”

Section: Results and Discussion-cystodium-supporting

confidence: 56%

“…is known only from Malaysia (Holttum, 1963). Its morphology, anatomy, cytology, distribution, and taxonomy have been discussed by Holttum and Sen (1961), Holttum (1963), Atkinson (1965), Roy and Holttum (1965), Sen and Mittra (1966), and Thurston (1969). Holttum and Sen (1961) reported 64 spores per sporangium in all of the cyatheoid and dicksonioid genera they discussed.…”

Section: Results and Discussion-cystodium-mentioning

confidence: 99%

“…7, x 500; all others x t ,000. production unlikely. Although the production of both antheridia and archegonia by a gametophyte does not necessarily mean that its reproduction is sexual (see , for example, Bomm eria pedata [Gastony and Haufler, 1976]), the production of both types of sex organs by gametophytes of C. sorbifolium (Atkinson, 1965) correlates with its mitotic/meiotic cytology in suggesting that this species is not apogamous. Whether other than taxonomic significance can be attributed to the sporangial capacity of C. sorbifolium is therefore presently unknown.…”

Section: Results and Discussion-cystodium-mentioning

confidence: 99%

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Spore Morphology in the Dicksoniaceae. I. The Genera Cystodium, Thyrsopteris, and Culcita

Gastony

1981

American J of Botany

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The most mature spores available in herbarium specimens of the dicksoniaceous genera Cystodium, Thyrsopteris, and Culcita were studied by scanning electron microscopy and light microscopy, and representative specimens were analyzed to determine the number of spores produced per sporangium. Thyrsopteris and Culcita feature 64‐spored sporangia, but Cystodium is consistently 32‐spored. Spores were analyzed both in their native state as found on the specimens and in a perine‐free state achieved by treatment with sodium hydroxide or acetolysis mixture. The sodium hydroxide assay demonstrated the presence of a perine in Cystodium, Thyrsopteris, and Culcita subgenus Culcita, but no evidence of a perine so defined was found in Culcita subgenus Calochlaena. Spores of Cystodium feature a nearly psilate exine overlain by a striate inner perine and a granular outer perine and are in several respects similar to those of Metaxya in the cyatheoid‐dicksonioid complex and to those of Saccoloma in the dennstaedtioids. The most mature Thyrsopteris spores available may not have been fully mature. They feature a sparsely distributed, granular perinous layer over a microverrucate sculptine. The latter topography is taken as largely perinous since treatment with sodium hydroxide left a nearly psilate exine. The spore morphologies of Cystodium and Thyrsopteris reinforce the taxonomic distinctness of these monotypic genera indicated by their other characters. The two subgenera of Culcita are very dissimilar in their spore morphologies. The exine in subgenus Culcita ranges from psilate to slightly microverrucate proximally and distally, with varying margo development. Spores of subgenus Calochlaena are strongly differentiated from those of subgenus Culcita by their exine of broad spinules which vary in their degree of lateral fusion to each other and in the granular appearance of their distal surfaces. Spore morphology in Culcita strongly supports the argument of those who would raise its subgenera to generic rank.

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“…Comparable perine fragility is evidenced in Cystodium (Fig. 5), a condition previously noted by Atkinson (1965). Beneath the perine, the exine is unsculptured (Fig.…”

Section: Results and Discussion-cystodium-supporting

confidence: 56%

Section: Results and Discussion-cystodium-mentioning

confidence: 99%

Section: Results and Discussion-cystodium-mentioning

confidence: 99%

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Spore Morphology in the Dicksoniaceae. I. The Genera Cystodium, Thyrsopteris, and Culcita

Gastony

1981

American J of Botany

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“…Little is known about the gametophyte of Athyriaceae, although it has been studied in some species and morphological differences have been observed throughout the group. In all the cases studied, a germination of the Vittaria type and the development of the Adiantum type gametophyte were observed (Atkinson 1967;Guo et al 2010;Nayar & Kaur 1971).…”

Section: Introductionmentioning

confidence: 86%

“…This indument can be located in the prothallus margin cells or on the surface of the lamina. Their function is varied: they provide protection from environmental conditions such as droughts or intense light exposure; they are also often associated with the protection of sexual organs, particularly archegonia (Atkinson 1967).…”

Section: Introductionmentioning

confidence: 99%

Study of the Gametophytic phase of Diplazium caudatum (Athyriaceae, Polypodiopsida) from Spain

Alonso¹,

Molino²,

Seral³

et al. 2021

Bot. Complut.

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The gametophytes of the Athyriaceae are not very well known, such as Diplazium caudatum. The aim of this work is to analyze the gametophytic phase of this species, which includes germination study, morphological development and reproductive phase. Spores belonging to two different sporophytes from La Gomera, Spain, were mixed and sown in multisporic cultures. Plates have been cultured in chambers with nutritive agar at 25ºC and 12 hours photoperiod. The germination was registered every three days, and the main vegetative and reproductive development was checked throughout the observational period. The germination rate reached a maximum of 58%. The spore germination followed a Vittaria pattern meanwhile prothallial development followed an Adiantum type. Regarding sexual expression, all gametophytes developed archegonia and later some of them developed antheridia becoming bisexual.

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Systematik der Farnpflanzen

Meyer

1966

Fortschritte Der Botanik

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The Gametophyte of Cystodium

Cited by 5 publications

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Spore Morphology in the Dicksoniaceae. I. The Genera Cystodium, Thyrsopteris, and Culcita

Spore Morphology in the Dicksoniaceae. I. The Genera Cystodium, Thyrsopteris, and Culcita

Study of the Gametophytic phase of Diplazium caudatum (Athyriaceae, Polypodiopsida) from Spain

Systematik der Farnpflanzen

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