Micromorphology of outer exospore coatings in<i>Selaginella</i>megaspores

Moore, Susannah; Hemsley, Alan R.; Borsch, Thomas

doi:10.1080/00173130500537150

Cited by 8 publications

(6 citation statements)

References 53 publications

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“…In Isoetes japonica, the perispore has an unordered structure very different from the opalescent perispore walls found in some species of Selaginella (Hemsley et al, 1994;Moore et al, 2006). However, despite the different patterns of ultrastructural organisation observed within lycophytes, we agree with the consensus that the perispore forms, by self-assembly, from the products of the degeneration of the tapetum.…”

Section: Discussionsupporting

confidence: 77%

“…Then, as now, the majority of pteridophytes studied were ferns, with only a limited sampling of Lycopodiophyta. Previous studies of sporogenesis in Lycopodiophyta have investigated Lycopodium sensu lato (Lugardon, 1976;Pettitt, 1966Pettitt, , 1971bRowley, 1995), Selaginella (Pettitt, 1971b;Robert, 1971aRobert, , 1971bRobert, , 1971cSievers & Buchen, 1971;Lugardon, 1972;Buchen & Sievers, 1978a, 1978b, 1981Brown & Lemmon, 1985;Taylor, 1991;Morbelli & Rowley, 1993, 1999Hemsley et al, 1994;Morbelli, 1995;Rowley & Morbelli, 1995Rowley et al, 2002;Morbelli et al, 2003;Moore et al, 2006) and Isoetes (Lugardon, 1973(Lugardon, , 1990Robert et al, 1973;Brown & Lemmon, 1989Taylor, 1992).…”

Section: Abstract: Sporoderm Development Perispore Exosporementioning

confidence: 99%

“…been the subject of considerable attention in recent years (Hemsley et al, 1994;Morbelli et al, 2003;Moore et al, 2006).…”

Section: Abstract: Sporoderm Development Perispore Exosporementioning

confidence: 99%

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Development of megaspores and microspores inIsoetes japonicaA. Br. (Lycopodiophyta: Isoetaceae)

Blackmore¹,

Takahashi²,

Uehara³

et al. 2012

Grana

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Section: Discussionsupporting

confidence: 77%

Section: Abstract: Sporoderm Development Perispore Exosporementioning

confidence: 99%

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Development of megaspores and microspores inIsoetes japonicaA. Br. (Lycopodiophyta: Isoetaceae)

Blackmore¹,

Takahashi²,

Uehara³

et al. 2012

Grana

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“…Figure 4E, not considered in the description) are 'inner bodies' that have been released from broken specimens, in which case they would be composed solely of an inner separable layer of exine (cf. Moore et al, 2006). So far, however, it has not been possible either to prove or to refute this suggestion.…”

Section: Diagnosis -As For Genusmentioning

confidence: 71%

An unusual megaspore of uncertain systematic affinity from Lower Cretaceous deposits in south-east England and its biostratigraphic and palaeoenvironmental significance

Batten

2009

Grana

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Batten, D. J. (2009). An unusual megaspore of uncertain systematic affinity from Lower Cretaceous deposits in south-east England and its biostratigraphic and palaeoenvironmental significance. Grana, 48(4), 270-280.An unusual megaspore has been recorded from beds within the Weald Clay Group of south-east England. Described as Clockhousea capelensis gen. et sp. nov., it is characterised by having a thick outer layer of exine consisting of closely packed columnar to clavate elements with constricted bases attached to a perforated inner layer and a sculpture that ranges from having the appearance of a negative reticulum through closely spaced verrucae to a mixture of verrucate and essentially baculate elements, all of which are surface manifestations and extensions of the underlying structure. These characters do not readily indicate a systematic relationship with any known heterosporous plant genus or family. The localised occurrence and relative abundance of the spores in a few beds suggest that some of the parent plants grew close to water bodies where they were deposited and preserved. Their recovery from sediments of late Hauterivian-early Barremian age indicates that the species has potential as a biostratigraphic marker in the upper Wealden succession of southern England and perhaps elsewhere.Peer reviewe

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“…Based on a number of shared derived characters such as the ligule and heterospory, the family appears to be most closely related to the Selaginellaceae. Moore et al (2006) suggested homology of the megaspore sporoderm layers in Isoëtes and Selaginella based on their own investigations and previously published data by Taylor (1993) and Macluf et al (2003): both share a siliceous outer coating, followed by an (outer and inner) sporopolleninous exospore, an inner separable layer and a cellulosic endospore, an organisation already identified by Tchistiakoff (1873).…”

mentioning

confidence: 71%

Micromorphological approach to the systematics of MediterraneanIsoëtesspecies (Isoëtaceae, Lycopodiophyta): analysis of the megaspore surface

Troìa

Bazan

Schicchi

2012

Grana

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Megaspore ornamentation is one of the few morphological characters used in the taxonomy of the genus Isoëtes. In the present work, we test the application of this character for distinguishing some Isoëtes species occurring in the Mediterranean: Isoëtes sicula, which according to some authors should be included as a variety in I. histrix, and the recently described I. todaroana, whose affinity with other taxa is currently unknown. Two additional species (I. duriei, I. velata) were also included in the analysis. The megaspores were studied using scanning electron microscopy combined with energy-dispersive X-ray spectroscopy and chemical treatment. In all species, the megaspore surface is covered by a siliceous coating; removal of this coating reveals an underlying three-dimensional network of fused rodlets. A unique pattern of this network occurs in I. sicula, supporting its separation from I. histrix. Comparison between the patterns observed in the examined Mediterranean species shows that I. todaroana is most similar to I. histrix.

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Micromorphology of outer exospore coatings inSelaginellamegaspores

Cited by 8 publications

References 53 publications

Development of megaspores and microspores inIsoetes japonicaA. Br. (Lycopodiophyta: Isoetaceae)

Development of megaspores and microspores inIsoetes japonicaA. Br. (Lycopodiophyta: Isoetaceae)

An unusual megaspore of uncertain systematic affinity from Lower Cretaceous deposits in south-east England and its biostratigraphic and palaeoenvironmental significance

Micromorphological approach to the systematics of MediterraneanIsoëtesspecies (Isoëtaceae, Lycopodiophyta): analysis of the megaspore surface

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