Figure 2 from: Gebauer R, Řepka R, Šmudla R, Mamoňová M, Ďurkovič J (2016) Anatomical and morphological spine variation in Gymnocalycium kieslingii subsp. castaneum (Cactaceae). PhytoKeys 69: 1-15. https://doi.org/10.3897/phytokeys.69.8847

Figure 2 - SEM images of upper, middle and basal part of Gymnocalycium kieslingii subsp. castaneum. a surface of spine from basal part covered with mineral deposition b, c surface of spine from basal part with a few epidermal cells d damaged, bent and deformed tip of spine from basal part e surface of spine from middle part with clearly visible epidermal cells sharply bent upward in upper part f surface of spine from upper part with very clearly visible and undamaged epidermal cells g undamaged top part of spine from upper part h epidermal cells of spine from upper part, bent lengthwise in its central part. Scale bar = 200 µm.