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Ukr. Bot. J. 2014, 71(6): 690–695
https://doi.org/10.15407/ukrbotj71.06.690
Plant Taxonomy, Geography and Floristics

Ultrastructure of the achene surface of Pilosella (Asteraceae) species in the Crimean flora

Pavlenko-Barysheva V.S.
Abstract

The surface ultrastructure (achene sculpture) of fruits of 12 species of the genus Pilosella in the Crimean flora was studied using SEM. Both common (tumulose surface on the costal region; hooks on the apical ends of exocarp cells, wrinkled surface of the cells; globular structures  — micropapillae, achene tip with beak-like outgrowths) and specific characters of the achene ultrastructure of the studied species have been revealed. Most of them are additional diagnostic characters at the sectional level: length to width ratio of exocarp, the shape of hook tips (sect. Praealtina), localization of micropapillae, presence of thickened anticlinal walls (sect. Echinina); some characters are diagnostic at the species level: the type of surface on the intercostal region, and number of micropapillae.

Keywords: Pilosella, achene, SEM, surface ultrastructure, fruit, flora, Crimea, Ukraine

Full text: PDF (Ukr) 5.85M

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