Comparative Studies of the Nodal and Vascular Anatomy in the Neotropical Cyatheaceae. Ii. Squamate Genera

Lucansky, Terry W.

doi:10.1002/j.1537-2197.1974.tb10786.x

Cited by 14 publications

(10 citation statements)

References 21 publications

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“…the margin or body of the scale (Tryon, 1970) (Tryon, 1970, p. 26 The stelar pattern in the mature stem is similar in all squamate genera, including Alsophila and Nephelea (Lucansky, 1974). In all species in this study the stelar pattern is a dictyostele composed of individual meristeles each surrounded by sclerenchymatous tissue (Figs.…”

Section: Resultsmentioning

confidence: 70%

“…Based on habit, stem and petiole indument, stelar pattern, and nodal anatomy of mature specimens, Alsophila and Nephelea show striking similarities and a close phyletic relationship (Lucansky, 1974;Lucansky & White, 1974). Members ot both genera are arborescent, with the upright habit being the derived condition in the Cyatheaceae (Bower, 1912, p. 293).…”

Section: Resultsmentioning

confidence: 99%

“…The taxonomic treatment of the Cyatheaceae has undergone numerous revisions as summarized in previous studies (Tryon, 1970;Gastony, 1973;Lucansky, 1974). Earlier research has shown the taxonomic importance of anatomy and morphology to the study of this group of ferns (Holttum & Sen. 1961;Sen, 1964;Lucansky, 1974;Lucansky & White, 1974). Yet, despite this renewal of interest in the tree ferns, comparative anatomical data are almost totally lacking for the neotropical species.…”

Section: Terry W Lucansky*mentioning

confidence: 99%

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Anatomical Studies of the Neotropical Cyatheaceae. I. Alsophila and Nephelea

Lucansky¹

1976

American Fern Journal

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Section: Resultsmentioning

confidence: 70%

Section: Resultsmentioning

confidence: 99%

Section: Terry W Lucansky*mentioning

confidence: 99%

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Anatomical Studies of the Neotropical Cyatheaceae. I. Alsophila and Nephelea

Lucansky¹

1976

American Fern Journal

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“…Due to subsequent geologic and climatic changes, many of their ancestral species became extinct. Only some survived in tropical and subtropical montane zones with relictual distributions (Lucansky, 1974; Willis and McElwain, 2002). Extant A. podophylla are mainly restricted to rain forests at altitudes of 350-700 m, growing on shaded meadows, wetlands or by streamsides.…”

mentioning

confidence: 99%

Genetic Variation and Phylogeographical Patterns in Alsophila podophylla from Southern China Based on cpDNAatpB-rbcL Sequence Data

Su¹,

Wang²,

Zheng³

et al. 2005

American Fern Journal

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Chloroplast DNA (cpDNA) atpB-rbcL intergenii spacers o\ individuals of Alsophila podophylla, collected from eight relict populations distributed in Hainan and Guangdong Province, southern China, were sequenced. Sequence sizes were 726 or 727bp. Base composition had a high A+T content of 62.67-63.00%. Sequences were assessed as evolutionarily neutral 0.76638, P > 0.10). Eight haplotypes were identified based on a statistical parsimony algorithm. A high level of haplotype diversity (h = 0.618) and a low nucleotide diversity [Dij = 0.00208) were detected in A. podophylla. Populations from Hainan shared common haplotypes with those from Guangdong. A network and a NJ tree constructed from cpDNA haplotypes both suggested a close genetic relationship among populations distributed in Hainan and Guangdong. Observed F ST (=0.10537), gene flow Nm (=2.12), AMOVA (Only 0.49% of variation was partitioned among regions, P -0.09), and DNA divergence data cnnsislciith indicated that no geographical differentiation occured at the interregional level. Geographic isolation has not yet resulted in population differentiations within A. podophylla populations in Hainan and Guangdong. Phylogeographical patterns of atpB-rbcL haplotypes demonstrate a 'star-like' feature, which means that populations of A. podophylla have experienced population expansion, and, since then there has been insufficient time to form a more complicated population structure. The majority of haplotypes coalesced near the tip of the NJ tree, indicating recent coalescence events as well. l analysis of atpB-rbcL sequences of A. podophylla.Alsophila podophylla Hook, is a small tree fern belonging to Alsophila subgenus Gymnosphaera of the Cyatheaceae (Xia, 1989). With erect or tilted trunks, it averages 2 m in height and has 2-pinnate-pinnatind fronds at the apex; its sori are round, lack indusia, and are located on raised receptacles positioned at the base of veins (Chen, 1964). Cyatheoids were globally distributed during the middle Mesozoic. Due to subsequent geologic and climatic changes, many of their ancestral species became extinct. Only some survived in tropical and subtropical montane zones with relictual distributions (Lucansky, 1974; Willis and McElwain, 2002). Extant A. podophylla are mainly restricted to rain forests at altitudes of 350-700 m, growing on shaded meadows, wetlands or by streamsides.

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“…The relationships among these genera and their arrangement into a family or families, however, are matters of considerable uncertainty and disagreement. A brief historical review of the diversity of opinion in this regard has been presented by Lucansky (1974). The current uncertainty as to the familial disposition of these taxa stems from Holttum's (1963) decision to return them to a single family, Cyatheaceae in the broadest sense, and Tryon's (1970) decision to treat only the Cyatheaceae in the narrow sense and to leave in abeyance the problems raised by the dicksonioid genera, pending the acquisition of more information.…”

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confidence: 99%

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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Comparative Studies of the Nodal and Vascular Anatomy in the Neotropical Cyatheaceae. Ii. Squamate Genera

Cited by 14 publications

References 21 publications

Anatomical Studies of the Neotropical Cyatheaceae. I. Alsophila and Nephelea

Anatomical Studies of the Neotropical Cyatheaceae. I. Alsophila and Nephelea

Genetic Variation and Phylogeographical Patterns in Alsophila podophylla from Southern China Based on cpDNAatpB-rbcL Sequence Data

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

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