Table 1.
List of localities of the Erica studied species.
Fig 1.
A-O. E. fastigiata, A. A, monad (pollen grain) in polar view, psilate at the poles and along the colpi; E. glabella, B-C. B, three pollen in polar view; C, equatorial view with two colpi; E. globiceps, D-F. D, polar view with three colpi; E, equatorial view; F, polar area with three colpi; E. nabea, G-I. G, polar view with three short colpi, H—equatorial view, I—colpus with opened porus; E. plumose, J-K. J, polar view with three colpi, K, granulate-fossulate exine ornamentation; E. puberuliflora L-O. L, pollen grains in polar and equatorial view, M, two pollen grains in polar and equatorial view, N, granulate-fossulate exine ornamentation O, granulate-fossulate exine ornamentation.
Fig 2.
A-N. E. adnata, A-B. A, tetrad in proximal face with three colpori, B, tetrad in distal face with one colpori; E. arborea, C-E. C, A few tertads in proximal and distal face, D, tetrad in proximal face with colpori, E, tertad in lateral view; E. australis, F-H. F, over a dozen of tertads in proximal and distal face, G, tetrad in proximal face with three, narrow colpori, H, granulate-fossulate exine ornamentation with clearly visible, numerous microgranules; E. axillaris, I-J. I, tertad in lateral view with colporus, J, granulate exine ornamentation without microgranules; E. baccans, K-L. K, tetrad in proximal face with three, opened colpori, L, tertad in lateral view with colporus; E. baroniana, M-N. M, tertad in lateral view with closed colpori, N, granulate-fossulate exine ornamentation with clearly visible, numerous microgranules.
Fig 3.
A-N. E. caffra, A-D. A, two tetrads in proximal face with colpori, B, tetrad in proximal face with three, closed colpori, C, opened colpori, D, two opened colpori and psilate exine ornamentation with microgranules; E. cinerea, E-F. E, tetrad in proximal face with three, opened colpori, F, opened colpori of two neighboring pollen grains; E. coccinea, G-H. G, tetrad in proximal face with three, opened colpori, H—tetrad in proximal face with closed, narrow colpori; E. curviflora, I-K. I, tetrad in proximal face, granulate-fossulate exine ornamentation with psilate “belts” at the poles and along the colpi, J, tetrad in lateral view with narrow colporus, K, proximal pole with three narrow opened colpori; E. denticulate, L-N. L, tetrad in proximal face with three narrow, opened colpori, M, tetrad in lateral view with colporus, N, narrow colporus.
Fig 4.
A-R. E. diosmifolia, A-C. A, tetrad in proximal with narrow colpori of neighboring pollen grains, B, tetrad in lateral view with narrow colporus, C, proximal pole with fossulate exine ornamentation; E. discolor, D-F. D, tetrad in proximal face, exine with psilate “belts” at the poles and along the colpi, E, tetrad in lateral view with narrow, opened colporus, F, narrow, opened colporus and exine ornamentation; E. erigena G-I. G, tetrad in proximal face, H, tetrad in lateral view with narrow, opened colporus, I, narrow, closed colporus; E. hirtiflora, J-K. J, two tetrads in proximal face and lateral view, K, tetrad in proximal face with narrow colpori; E. hispidula, L-M. L, tetrad in proximal face, granulate-fossulate exine ornamentation, M, granulae and fossulae with very numerous microgranules; E. imbricate, N-R. N, three tetrads in proximal and distal face, O, two tetrads in proximal face and lateral view, P, narrow, closed colporus, R, proximal pole, granulate-fossulate exine ornamentation with very numerous microgranules.
Fig 5.
A-S. E. lanipes, A-C A, tetrad in proximal face with psilate exine ornamentation, B, tetrad in lateral view, C, narrow, opened colporus; E. lasciva, D-E D, four tetras in proximal and distal face, E, fossulate exine ornamentation with very numerous microgranules; E. lucida F-H. F, tetrad in proximal face with narrow colpori, G, tetrad in lateral view, H, narrow, opened colporus; E. melanthera, I-K. I, two tetrads in lateral view, J, tetrad in proximal face, K, proximal pole with narrow closed colpori; E. monsoniana, L-N. L, tetrad in proximal face with narrow, opened colpori, M, tetrad in proximal face with narrow, closed colpori, N, proximal pole with microgranules, O, exine with psilate “belts” along the colporus; E. parviflora, P-S. P, two tetrads in proximal and distal face, R, tetrad in proximal face with narrow, closed colpori, S, tetrad in lateral view.
Fig 6.
A-P. E. passerinae, A-C. A, tetrad in proximal face; granulate-fossulate exine ornamentation with psilate “belts” at the poles and along the colpi, B, tetrad in lateral view, C, granulate-fossulate exine ornamentation with very numerous microgranules; E. peziza, D-F. D, tetrad in proximal face, E, tetrad in lateral view, F, granulate-fossulate exine ornamentation; E. plukenetii, G-H. G, tetrad in proximal face with opened colpori and psilate exine ornamentation, H, tetrad in lateral view with opened colpore; E. regia, I-J. I, tetrad in proximal face; granulate-fossulate exine ornamentation, psilate at the poles and along the colpi, J, colporus; E. sparsa, K-M. K, tetrad in proximal face, L, tetrad in lateral view with closed colporus, M, fossulae with very numerous microgranules; E. tenella, N-P. N, tetrad in proximal face, O, tetrad in distal face, P, granulate-fossulate exine ornamentation and colporus.
Fig 7.
A-P. E. tetralix, A-C. A, tetrads in proximal and distal faces and in lateral view, B, tetrad in proximal face; exine ornamentation granulate-fossulate and psilate at the poles and along the colpi, C, colporus and very numerous microgranules; E. totta, D-E. D, tetrad in proximal face; exine ornamentation granulate-fossulate and psilate at the poles and along the colpi, E, opened colporus; E. trichophylla, F-H F, tetrad in proximal face, G, tetrad in lateral view, H, closed colporus; E. umebellata, I-K. I, tetrad in proximal face, J, tetrad in lateral view, K, granulate-fossulate exine ornamentation with very numerous microgranules; E. vestita, L-N. L, tetrad in proximal face; exine ornamentation granulate-fossulate and psilate at the poles and along the colpi, M, tetrad in lateral view, colporus with a bridge; E. zwartbergensis, N-P. N, tetrad in proximal face, O, tetrad with numerous fossulae, P, fossulae with very numerous microgranules.
Table 2.
Minimal, maximal and mean values as well as coefficients of variation (CV) for observed traits of species with monads.
Table 3.
Minimal, maximal and mean values as well as coefficients of variation (CV) for observed traits of species with tetrads.
Table 4.
Minimal, maximal and mean values as well as coefficients of variation (CV) for observed traits of species with tetrads.
Table 5.
Minimal, maximal and mean values as well as coefficients of variation (CV) for observed traits of species with tetrads.
Fig 8.
Box-and-whisker diagram of the values of diameter (D), classified by the tetrads’ species.
Table 6.
Correlation matrix for the observed features of species with monads.
Fig 9.
Box-and-whisker diagram of the values of P/E for monads and P/d for tetrads.
Fig 10.
Box-and-whisker diagram of the values of 2f/D, classified by the tetrads’ species.
Fig 11.
Distribution of 39 Erica species with tetrads in the space of two first canonical variables.
Fig 12.
Dendrogram of cluster groupings of Erica species with tetrads on the basis of pollen grain morphological features.
Table 7.
Correlation matrix for the observed features of species with tetrads.
Fig 13.
Distribution of six Erica species with monads in the space of two first canonical variables.
Fig 14.
Dendrogram of cluster groupings of Erica species with monads on the basis of pollen grain morphological features.