Morphology of Backusella oblongispora. (A), Colony on SMA. (B), Colony on PDA. (C), Colony on MEA. (D), Sporangium on circinate branches. (E–H), Young and mature sporangia. (I–L), Columellae of various shapes. (M), Sporangiospores. Scale bars: E–L = 50 μm, M = 20 μm.