Torenia maculata (Linderniaceae), a new record for Thailand

Sutthisaksopon, Phanom; Chantaranothai, Pranom; Suddee, Somran; Conservation, Bangkok Plant

doi:10.20531/tfb.2021.49.2.04

Cited by 1 publication

(2 citation statements)

References 3 publications

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“…These ferns are heliophilous, predominantly terrestrial or epilithic plants that grow in the Palaeotropical, Neotropical and Australian realms (Takhtajan 1978; Kramer 1990; Lindsay et al . 2003; Perrie et al . 2007; Santos et al .…”

Section: Taxon Region Strat Range Occmentioning

confidence: 99%

“…T H E Gleicheniales is an ancient order (clade) of leptosporangiate ferns that was ubiquitous and diverse in the Mesozoic (Skog 2001), but which is represented today by only the relic families Gleicheniaceae, Matoniaceae and Dipteridaceae. These ferns are heliophilous, predominantly terrestrial or epilithic plants that grow in the Palaeotropical, Neotropical and Australian realms (Takhtajan 1978; Kramer 1990;Lindsay et al 2003;Perrie et al 2007;Santos et al 2010;Barcelona & Pelser 2014;Perrie & Brownsey 2015;Wei et al 2021). All extant members of the Gleicheniales share morphological features such as 3-5 protoxylem poles in root steles and antheridia with walls containing 6-12 narrow cells (Simpson 2019).…”

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confidence: 99%

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Maiaspora: the hallmark of gleichenioid ferns (Gleicheniales) from the early Carboniferous

Mamontov,

McLean,

Gavrilova

2024

Papers in Palaeontology

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The Palaeozoic origin of gleichenioid ferns (Gleicheniales) has aroused curiosity for almost a century. The oldest definite sign of this ancient clade is the spore wall ultrastructure of Radiitheca dobranyana from the Moscovian of central Europe. However, familial assignment of this fern fossil is uncertain. A comparison of its in situ spores with those of the dispersed genus Maiaspora, from the Visean, suggests that they may represent the same group of leptosporangiates. Although these spores have a common metareticuloid sculpture, the ultra‐thin structure of the dispersed counterparts remained unknown. Study of the ultrastructure of Maiaspora concava and M. panopta from central Russia and Northumberland (UK) using transmission electron microscopy shows that the wall of Maiaspora has a middle exospore layer composed of foliated lamellae. These spread from the base of the aperture slit to the subequatorial margins of kyrtome areas. The lamellae do not overlap the aperture slit and terminate at between two‐thirds and three‐quarters of the slit height. The miospores have a three‐layered exospore in the interradial areas, while non‐apertural parts of the exospore consist of two layers. Such an ultrastructure is shared by extant Gleicheniales and fossil R. dobranyana. The combined evidence from the morphology, ultrastructure and spatiotemporal distribution of Maiaspora, as well as radioisotope dating and additional plant macrofossils, suggests that the origin of the Gleicheniales stem was related to closure of the Rheic Ocean. Apparently, the first Maiaspora‐producing gleichenioids emerged as neoendemic terrestrial ferns on the peri‐Gondwanan volcanic arcs.

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Section: Taxon Region Strat Range Occmentioning

confidence: 99%