Fig. 3From: A stem group Codium alga from the latest Ediacaran of South China provides taxonomic insight into the early diversification of the plant kingdomDetailed anatomy of Protocodium sinense and comparison with modern Codium. a NWULJG 10,034, SEM close-up of thallus surface, showing contacts between utricle tips. b–d NWULJG 10,026. b Tomographic close-up in cross section, showing utricles are tightly packed and clavate to cylindrical, with tips rounded and smooth. c Tomographic close-up in cross section, showing siphonous branching at base of utricles. Yellow solid arrows point to bifurcations of the main basal siphon. d Close-up of medullar siphons. e Diagrammatic reconstruction of Protocodium sinense. f SEM imaging of a cross section of an extant Codium fragile ssp. tomentosoides thallus (reproduced with permission from Jim Provan). Scale bars: a 20 μm, b 10 μm, c 50 μm, d 20 μm, f 500 μmBack to article page