The Structure of Petioles in Pteris (Pteridaceae)

被引：2

作者：

Martinez, Olga G. ^{[1
]}

Vilte, Ignacio ^{[1
]}

机构：

[1] Univ Nacl Salta, Fac Cs Nat, IBIGEO, Herbario MCNS, RA-4400 Salta, Argentina

来源：

AMERICAN FERN JOURNAL | 2012年 / 102卷 / 01期

关键词：

Pteris; vascular bundles; petioles; ventilation areas; FERNS; DRYOPTERIDACEAE; VESSELS; ANATOMY; SEM;

D O I：

暂无

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

We studied the petiole structure of twelve American species of Pteris: P. ciliaris, P. cretica, P. deflexa, P. denticulate, P. ensiformis, P. exigue. P. Merlins, P. multifida, P. mutilata, P. quadriaurita, P. tristicula and P. vittata, using both light and scanning electron microscopy. We found that petioles are characterized externally by the presence of an adaxial groove and two dorsal-lateral ventilation areas. Internally, petioles are monostelic V-, U- or inverted-Q-shaped axes. The vascular system is surrounded by one endodermis cell layer and 1-3 pericycle strata. We propose a classification of the vascular bundles into four types considering their shape, the shape of the xylem ends, the number of protoxylem zones and the presence of parenchyma bands in the xylem.

引用

页码：1 / 10

页数：10

共 26 条

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