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Shiro TSUYUZAKI
Plant community ecology / Environmental conservation

Mount Usu / Sarobetsu post-mined peatland
From left: Crater basin in 1986 and 2006. Cottongrass / Daylily

(First update on October 30 2003. Last on November 12 2009)

Asian Brake
Pteris mutilata Burm. (Pteridaceae)

No Japanese name (* アジアイノモトソウ, 試訳 tentative translation)

Lifeform: perennial fern
Habitat: open woodlands


Pteris mutilata

Phillippines
Fig. 1. Silhouettes of leaves of Pteris mutilata showing the change of shape and size according to development stages. Arrows indicate pinnae with sori. A-C: young (A) to older leaves. D: mature leaf. (Tsuyuzaki 2000)


Number of veins (NV)
vein (nervure)

[Botany] One of the vascular bundles or ribs that form the branching framework of conducting and supporting tissues in a leaf or other expanded plant organ

nunmber of veins

NV
Fig. 1. Schematic representation of the leaf development of Dryopteris saxifraga. Number indicates the number of veins on each leaf. Arrows with number indicate the counting method of number of veins. FL, a fertile leaf with sporangia. (Sato 1985)

  • Tsuyuzaki, S. 2000. Characteristics of "number of veins" to estimate leaf maturity in Pteris mutilata (Pteridaceae). Journal of Plant Research 113: 415-418
    Abstract: In this report, the author suggests that the number of veins (NV) is useful to estimate leaf maturation for a tropical fern Pteris mutilata, as has been established in ferns of cool temperate regions. NV expressed developmental stages better than any other leaf size parameters, such as blade length, blade width, stipe length, and total length (blade+stipe length). The leaf shape became more oblong and/or slender after the plant matured, which could be measured by two shape parameters, (blade width)/(total length) and (blade width)/(blade length). Principal component analysis using all the morphological parameters showed that NV is categorized into size parameters, although NV has been considered to differ somehow from the other size parameters. Thus NV represents one of the size parameters that is the most appropriate to estimate leaf maturation.
References
  • Sato, T. & Tsuyuzaki, S. 1988. Quantitative comparison of foliage development among Dryopteris monticola, D. tokyoensis and a putative hybrid, D. kominatoensis, in northern Japan. Botanical Magazine, Tokyo 101: 267-280
  • Tsuyuzaki, S. 2000. Characteristics of "number of veins" to estimate leaf maturity in Pteris mutilata (Pteridaceae). Journal of Plant Research 113: 415-418
  • Tsuyuzaki S & Taguiam CG. 2007. Ecosystems and agro-forestry systems in Luzon Island, Philippines. Activity report: IGBP-MESCC/TEMA

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