Figs 12-21

Characteristic spore bases and subtending hyphae (sh) in Glomeromycetes genera with glomoid spore formation. Figs 12 – 13 . Glomus ambisporum (Oehl collection, from Bolivia) and G. aureum (type, ZT Myc 822) with two wall layers (SWL1 and SWL2), marked introverted wall thickening at sb and in sh, and a small, bridging septum (sp). Fig. 14 . Funneliformis coronatus (ex type, Oehl collection) with funnel-shaped sh and conspicuous sp; introverted wall thickening is lacking. Fig. 15 . Septoglomus constrictum (Oehl collection, from Switzerland) with conspicuous septum that sometimes resembles a plug. Fig. 16 . Simiglomus hoi (Oehl collection, specimen mounted at York university) with cylindrical sh; sh wall thickened over long distances; several septae are regularly observed within the hyphae; no introverted wall thickening at sb, pore at sb generally opened. Fig. 17 . Claroideoglomus etunicatum (Oehl collection, from Bolivia) with funnel/bill-shaped, white sh; all Entrophosporaceae (syn. Claroideoglomeraceae) with characteristic color change of structural wall layer at sb, if spores are pigmented. Fig. 18. Albahypha drummondii (type, DPP) with slightly funnel-shaped, white sh. Fig. 19 . Viscospora viscosa (ex type, photo taken at INVAM) with cylindrical, white hypha; sp within sh in some distance of sb; introverted wall thickening of sh at sp position, here not that obvious as usually found for this species; viscose spore surface. Fig. 20 . Diversispora versiformis with short, fragile sh that is principally continuous with semi-persistent outermost spore wall layer (SWL1) but not with structural layer SWL2 (Oehl collection, from Tibet). Fig. 21 . Redeckera fulva (Oehl ex Trappe collection) with inflating sh and conspicuous broad sp exactly at spore base.