73(71) Basidia with transverse septa. Spores 11 × 7µm. Fruit body pinkish. _Platygloea fimicola_ (Not British; included for completeness. _Pilacrella solani_, with a glistening stipitate head, has been isolated from dungy soil). - Basidia with longitudinal septa. Spores 14-18 × 9-10µm. Fruit body cream-white or ivory. _Sebacina incrustans_ [Illustration: FIG. 65. Habit sketch of _Typhula_ sp. Note attachment to sclerotium. FIG. 66. _Sphaerobolus stellatus_, habit. FIG. 67. _Clitopilus passackerianus_, a sessile agaric--habit sketch and section.] Key 4. Zygomycota 1 Spores formed in multispored sporangia (figs 68, 70, 72, 75, 76) or in few-spored sporangioles (figs 70, 73). 2 - Multispored sporangia and globose sporangioles absent. Spores formed singly on terminal, lateral or intermediate vesicles (figs 74, 79, 80, 82-86), or in short chains (figs 77, 78, 81). 11 2(1) Sporangiophore stout, simple, with a subsporangial swelling and a basal swelling buried in the substrate. Sporangia tough walled, black, projected some distance towards the light when mature, and sticking to whatever they hit. _Pilobolus_ (fig. 76) e.g. spores pale yellow, 8-10 × 5-6µm - _P. crystallinus_ spores orange, 12-20 × 6-10µm. - _P. kleinii_ - Sporangiophores not stout; sporangia not violently discharged. 3 3(2) Sporangial wall black, tough, not readily broken when touched. Sporangia with a sticky base, becoming attached to whatever they contact after the marked elongation of the white sporangiophores at maturity. _Pilaira_ (fig. 75) e.g. spores yellowish, 8-10 × 6µm - _P. anomala_ spores colourless, 11-13 × 6-8µm - _P. moreaui_ - Sporangial wall diffluent, spores readily removed in a droplet, or fragile and then spores easily dispersed by external violence. 4 4(3) Sporangiophores stiff and metallic in appearance, growing towards the light and often to great length (5-30cm). _Phycomyces_ e.g. spores 10.5-30 × 6.5-17µm; columella pyriform; sporangiophores up to 30cm - _P. nitens_ spores 8-13 × 5-7.5µm; columella spherical or ovoid; sporangiophores up to 30cm - _P. blakesleeanus_ - Sporangiophores white, not reaching extreme lengths. 5