Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 96. (Budapest 2004)

Kováts, D.: Some differences in morphological structure of the vegetative parts (herbage) of Sesleria heufleriana Schur and Sesleria hungarica Ujhelyi (Poaceae)

the culms of Sesleria heufleriana. Here the leaf blades are longer ( 1.5 cm) than the leaf sheaths (8/6.5 cm). Whereas at Sesleria hungarica on this level the lengths of leaf blades are not yet half the lengths of the leaf sheaths (4/9 cm). The change of ratio in lengths of leaf blades and sheaths takes place only at the third youngest leaves from above the culms of Sesleria hungarica (in ratio 19/7 cm), (Fig. 3, Tables 3-4). This change of ratio is already significant at the fourth youngest leaves from above the culms of both Sesleria taxa. At this level of culm the leaf blades are about 5 times longer than the leaf sheths (22+?/4.6cm, or 25+?/7cm). The lengths of leaf blades in most cases are uncertain because they are usually damaged, fragmentary. In this state of development, the lengths of culms are not completely measurable, as has been mentioned above. The lengths of the further lower leaf sheaths do not decrease yet, or only to a lesser degree, and on the other hand the leaf blades still further increase in lengths rather than decrease at the bottom of the culms while they are measurable (Fig. 3, Tables 3-4). Some other morphological observations and remarks Though not in keeping with the average data, certain population and sample differences are observable from the data of the average lengths of the leaf blades and sheaths, and their ratio, first of all at Sesleria heufleriana. In the foregoing demonstrated relations, the data of the leaf blades and sheaths are different in each case at the different levels of the culms. For example, at two populations of Sesleria heufleriana collected at Szarvaskő (population 2) and Szádvár (populaFig. 3. Ratio of the average length of leaf blades and leaf sheaths by different levels of culms