Abstract

Leaves’ anatomical characteristics are considered to be important diagnostic features for identifying grasses. Cross sections from the middle part of leaf blades have traditionally been used for such purposes. Leaf anatomy has been of key interest for identifying the representatives of the Festuca L. genus because of great morphological similarity between the species. Particular attention is paid to the arrangement of sclerenchyma in the middle part of the leaf blade. The lack of knowledge regarding the spatial distribution of tissues throughout the leaf blades of grasses does not allow one to evaluate the diagnostic significance of data obtained from a single, two-dimensional cross section. The aim of the work is to make 3D models of sclerenchyma from serial sections of leaf blades of two narrow-leaved fescues: Festuca valesiaca Gaud. and Festuca beckeri (Hack.) Trautv. Cross-sectional areas of sclerenchyma increase just above the blade/sheath junction and then gradually decrease up to the tips of the leaf blades in both species. Subepidermal sclerenchyma of the fescues appears as an uneven layer. The layer of F. beckeri is more or less solid, the layer of F. valesiaca is dissected by four long splits. Changes in the shape of sclerenchyma sections along the leaf blades are more pronounced in F. valesiaca than in F. beckeri. Variability of the sclerenchyma arrangements along the leaf blades should be considered when using 2D sections of the leaf for diagnostics of fescues.

中文翻译：

---

某些羊茅叶片的硬皮病的空间分布（Festuca L.，Gramineae Juss。）

摘要

叶子的解剖特征被认为是鉴定草的重要诊断特征。传统上将叶片中部的横截面用于这种目的。叶解剖学一直是识别Festuca代表的关键兴趣所在L.属由于在物种之间的巨大的形态相似性。特别要注意的是叶片中间部分的巩膜瘤的排列。缺乏有关整个草叶的组织空间分布的知识，使人们无法评估从一个二维横截面获得的数据的诊断意义。这项工作的目的是从两个窄叶羊茅的叶片（Festuca valesiaca Gaud）的叶片的连续切片中制作出巩膜瘤的3D模型。和贝斯凯里（哈克。）特劳特夫。巩膜瘤的横截面积在叶片/鞘交界处的正上方增加，然后逐渐减小直至两个物种的叶片尖端。胎儿的表皮下硬膜瘤表现为不均匀的层。的层 F. beckeri或多或少固体，层F. valesiaca由四个长分割解剖。缬草F. valesiaca中的叶片巩膜切片形状的变化比F中更为明显。贝克里。当使用叶片的2D切片进行粪便诊断时，应考虑沿叶片的巩膜排列的可变性。