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. Author manuscript; available in PMC: 2021 Dec 13.
Published in final edited form as: Nat Ecol Evol. 2020 Feb 24;4(4):543–549. doi: 10.1038/s41559-020-1122-9

Figure 2 |. Cellular structures of Proterocladus antiquus new species.

Figure 2 |

a–f, Fragmentary specimens extracted from rock matrix using HF acid maceration technique. VPIGM-4756, VPIGM-4757, VPIGM-4758, VPIGM-4759, VPIGM-4760, and VPIGM-4761, respectively. g–k, Well-preserved thallus on bedding surface. VPIGM-4762 (holotype). h–k are magnifications of labeled frames in g. Black and blue arrows denote robust septa and lateral pore, respectively. Cyan, blue, and purple arrowheads denote morphologically differentiated doliform hetermorphic cells, cyathiform hetermorphic cells, and narrow apical extensions, respectively. Scale bars equal 100 μm unless otherwise specified. All photos taken by authors.