- (mycology) Having a structure which is distinctly enlarged in the middle and tapered toward both ends
1904, George Massee, “A Monograph of the genus Inocybe, Karsten”, in Annals of Botany, volume 18, page 467:
- […] sp. irregularly elliptic-oblong (angulato-ellipsoideis), 9-15 × 5-7 μ; c. fusoid-ventricose, 60-70 × 19-22 μ.
1983, Alexander Hanchett Smith, The Veiled Species of Hebeloma in the Western United States, page 7:
- The fusoid-ventricose type (fig. A13) apparently arises from the basidiole-type by elongation of the apical region of the cell to produce a ± narrow neck tapered to a more or less obtuse apex.
2015, Dennis E. Desjardin, California Mushrooms: The Comprehensive Identification Guide:
- SPORES 7–9 × 4–5 μm, ellipsoid, smooth, with an apical germ pore, thin-walled, purplish brown in deposit; cheilocystidia clavate or fusoid-ventricose; annulus, and fruits in fall and winter at lower elevations.