Dear Jacek,
Also many thanks for the article - a good find!
I agree with Wolter, that the comparison of the plants shown makes M. zublerae look rather different (darker and less elongated) than my own plants of this species. The SEM photos show some differences, but almost all SEM comparisons do not show the degree of variation of a species, just the topology of the seeds scanned, which may come from one extreme of the natural variation in the seed surface.
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Chris43, moderator