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. 2020 Oct 5;145(3):237–258. doi: 10.1007/s11120-020-00782-3

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© The Author(s) 2020

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Fig. 2 — Early electron micrographs of isolated chloroplast membranes. a Clusters of grana from individual, disrupted spinach chloroplasts air-dried on grid. The arrow points to a small, separated cluster of grana that appear interconnected by membranes (from Granick and Porter 1947). b Cluster of three, round, gold-shadowed grana “stacks” at high magnification (from Granick and Porter 1947). c Disassembled and gold-shadowed, disrupted granum of the shade plant Aspidistra that resembles a toppled stack of coins. From Steinmann (1952). Bar 1.0 mm