Spore morphology of Pityrogramma calomelanos (L.) Link (Pteridaceae)
Abstract
Comparative investigation of the spore surface ultrastructure of six specimens of Pityrogramma calomelanos (L.) Link (Pteridoideae, Pteridaceae) was carried out with using of scanning electronic microscopy (SEM). Specimens of Pityrogramma calomelanos were collected in the different parts of its range: in South China (Hainan Island), Nepal, Honduras, Ecuador, and Jamaica. It is established that for the spores of specimens collected in different parts of the range, the stability of the sculpture features and the low variability in size are characteristic. Spores are tetrahedral, trilete; laesura arms are thin and straight, equatorial diameter 48.1 (37.7–57.3) µm; distal side of spore is hemispherical, proximal side is convex or broadly conical. The stable features of the spore sculpture are the following: prominent equatorial flange protruding at 4.1 (2.5–7.8) μm, four uninterrupted ridges arranged parallel to equatorial flange and to each other on both proximal and distal sides of the spore (per two on the periphery of each side), thin and straight laesura arms, and reticular sculpture from irregularly arranged folds (rugulae) with the lumina irregular in shape on the both proximal and distal sides of the spore.
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