Taxonomy and Distribution of Adiantum trapeziforme and A. pentadactylon
Taxonomy and Distribution of Adiantum trapeziforme and A. pentadactylon
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铁线蕨和五足铁线蕨的分类及分布
DOI：
10.2307/1547765
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发表时间：
1998
影响因子：
0.8
通讯作者：
M. Palacios
中科院分区：
文献类型：
--
作者：
M. Palacios
标题梯形铁线蕨属和铁线铁线蕨属的分类和地理分布资料。&Fisch.提出了一种新的解决方案。这两个种在过去曾被混淆，并讨论了它们之间的区别。在编制巴西铁线蕨属(蕨科)分类修订本的过程中，资深作者注意到一些问题，涉及梯形铁线蕨属和五指铁线蕨属的划分和分布。前一种由Linneeus(1753)描述，并由Lellinger(1977)基于斯隆(1707：T.59)的插图进行分类。斯隆的插图没有清楚地显示该种的诊断特征，它可能与一个相关的分类单元--五龙分类单元混淆。铁线蕨属是由Langsdorff和Fischer(1810)描述的，其模式材料(可能是一个同型)在G(图BM，SP)。这种材料类似于梯形，但代表了不同的物种。多年来，几位作者以不同的方式对待这些物种，有时甚至是错误的。Hooker(1851)提到，这两个种都属于斜方藻类群，其特征是：“叶三回羽状或分解状；羽状突起几乎总是短的，等长的或近等长的，很少连续或拉长的，就像在特殊的伞形藻属和烟碱草属中一样。”然而，他没有澄清这些物种之间的差异。Fee(1869)引用Glaziou 2318(B，P)作为梯形变种。格拉齐奥的材料是在里约热内卢收集的，是五角龙的典型例子。根据Baker(1870)在《巴西植物志》中所述，五角龙是梯形植物的同义词。然而，贝克引用的材料，位于BM(Glaziou 438)和BR和P(Glaziou 1754)，显然是一种五角龙，是在里约热内卢收集的。基督(1900)描述了梯形变种。根据来自巴西圣卡塔利纳州的规范(Ule 51,195)制作的切面基督。据说该变种的不同之处在于其较少的苍白羽片，较薄的组织，裂片浅裂到基部的一半以上，以及通常分叉和钝的许多裂片(裂片两边各6-7个)。然而，P(Ule 195)的同型是一种五角龙。
Data concerning the taxonomy and geographic distribution of Adiantum trapeziforme L. and A. pentadactylon Langsd. & Fisch. are presented. Both species have been confused in the past and the distinctness between them is discussed. During the preparation of a taxonomic revision of Adiantum (Pteridaceae) in Brazil, the senior author noticed some problems involving the delimitation and distribution of A. trapeziforme and A. pentadactylon. The former species was described by Linnaeus (1753) and lectotypified by Lellinger (1977) based on an illustration by Sloane (1707: t. 59). Sloane's illustration does not clearly show the diagnostic characters for this species and it might be confused with A. pentadactylon, a related taxon. Adiantum pentadactylon was described by Langsdorff and Fischer (1810) and its type material (probably an isotype) is at G (photos BM, SP). This material resembles A. trapeziforme but represents a different species. Over the years, several authors have treated these species in different ways, sometimes erroneously. Hooker (1851) mentioned that both species belonged to the A. trapeziforme group, which is characterized by: "Fronds tripinnate or decompound; sori almost invariably short, equal or nearly so, rarely continu- ous or elongated, as in A. speciosum and fumarioides." He did not, however, clarify the differences between these species. Fee (1869) cited Glaziou 2318 (B, P) as A. trapeziforme f. B A. pentadactylon. Glaziou's material was collected in Rio de Janeiro and is a typical example of A. pentadactylon. According to Baker (1870) in Flora Brasiliensis, A. pentadactylon is a syn- onym of A. trapeziforme. Nevertheless, the material cited by Baker, located at BM (Glaziou 438) and BR and P (Glaziou 1754), are clearly A. pentadactylon, and were collected in Rio de Janeiro. Christ (1900) described A. trapeziforme var. incisum Christ based on spec- imens (Ule 51, 195) from the State of Santa Catarina, Brazil. The variety was said to differ in its less glaucous pinnules, thinner tissue, segments lobed more than half way to the base, and numerous lobes (6-7 on each side of the seg- ment) usually bifurcate and obtuse. The syntype at P (Ule 195), however, is A. pentadactylon.