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gem1 spores showing internal wall structures at tricellular stage. Internal walls appear relatively straight and simplified. Lipid bodies are no longer present adjacent to the walls. A through D, Complete (A) and partial (arrows in B–D) internal walls. E, Small projections of wall growth from the intine. F, Wall stub and stacked ER frequently observed in gem1. S, Starch grains. Scale bars: A–D = 3 μm; E and F = 0.5 μm.
