Synura petersenii f. columnata Siver

Kapustin, Dmitry A., Gusev, Evgeniy S., Lilitskaya, Galina G. & Kulikovskiy, Maxim S., 2020, Silica-scaled chrysophytes from the Ukrainian Polissia, Cryptogamie, Algologie 20 (12), pp. 121-135 : 132

Synura petersenii f. columnata Siver

( Fig. 4H )

DISTRIBUTION. — United States ( Siver 1988).

REMARKS

Differs from the other taxa of Synura petersenii -complex in that the inner portion of the rim is ornamented with row of posts (in SEM) or dots (in TEM) ( Siver 1988; Škaloud et al. 2012). Škaloud et al. (2012) believe that this forma does not belong to S. petersenii sensu stricto but it is premature to raise this forma to the rank of species.

Figures

FIG. 4. — Synura Ehrenb. taxa from the Ukrainian Polissia:A, Synura conopea Kynčlová & Škaloud,TEM;B, Synura echinulata Korshikov, SEM; C, Synura glabra, TEM; D, Synura heteropora Škaloud,Škaloudová & Procházková, TEM; E, Synura korshikovii Kapustin & Gusev, SEM; F, Synura macropora Škaloud & Kynčlová, TEM; G, Synura petersenii Korshikov, TEM; H, Synura petersenii f. columnata Siver, TEM; I, Synura sphagnicola (Korshikov) Korshikov, SEM; J, Synura spinosa f. spinosa Korshikov, SEM; K, Synura spinosa f. longispina J.B.Petersen & J.B.Hansen, TEM; L, Synura uvella Ehrenb. emend. Korshikov, SEM. Scale bars: A, C, D, F-H, K, 2 µm; B, E, I, J, L, 1 µm.