5(4) Small lateral sporangia (sporangioles) present. 10 - Sporangioles absent. 6 6(5) Sporangiophores usually grouped, less often single, connected by stolon-like hyphae. 7 - Sporangiophores arising singly, or if grouped then lacking stolon-like hyphae. 9 7(6) Stolons joining groups of sporangiophores often with rhizoids at the base of the group. 8 - Sporangiophores arising singly or in groups from stolons, which may be 'rooted' at intervals along their length, but rarely beneath the groups of sporangiophores. _Absidia_ (fig. 71) e.g. sporangiophores grouped, rhizoids poorly developed; spores 2.5-4.5µm diam. - _A. corymbifera_ sporangiophores grouped, rhizoids strongly developed; spores 2.5-3.5µm diam. - _A. orchidis_ 8(7) Sporangiophores mostly unbranched. _Rhizopus_ (fig. 69) e.g. spores irregularly angular-ovoid, 8-14 × 11µm - _R. nigricans_ - Sporangiophores with a whorl of branches beneath the main sporangium, each with a small columellate sporangium. Spores 6-8.5µm. _Actinomucor elegans_ [Illustration: FIG. 68. _Mucor_, habit and detail of sporangium before and after dehiscence. FIG. 69. _Rhizopus_, habit. FIG. 70. _Thamnidium elegans_, habit and detail of sporangioles. FIG. 71. _Absidia_, habit. FIG. 72. _Mortierella_, habit and sporangiophore tip after sporangial dehiscence. FIG. 73. _Helicostylum_, sporangioles. FIG. 74. _Chaetocladium_, sporangioles. FIG. 75. _Pilaira_, sporangiophores before and after elongation, and sporangium. FIG. 76. _Pilobolus_, sporangiophore. FIG. 77. _Syncephalis_, habit, sporangiophore and merosporangia. FIG. 78. _Piptocephalis_, habit and detail of final branch with head cell and merosporangia. FIG. 79. _Oedocephalum_, habit and sporing head. FIG. 80. _Rhopalomyces_, sporing head. FIG. 81. _Syncephalastrum_, habit and detail of merosporangium. FIG. 82. _Coemansia_, habit, sporoclade with sporangia and sporangium with spore inside. FIG. 83. _Kickxella_, habit and sporoclade. FIG. 84. _Cunninghamella_, habit and fertile head. FIG. 85. _Mycotypha_ (l) and _Ostracoderma_ (r) conidiophores. FIG. 86. _Ballocephala_, habit of sporangiophores growing from parasitised tardigrade, sporangiophore and sporangia.]