1	Villose resting spores produced	Conidiobolus coronatus
–	Villose resting spores not produced	2
2	Microspores produced	3
–	Microspores not observed	4
3	Two types of sexual reproduction, zygospores formed in axial alignment with one or both conjugating segments	5
–	One type of sexual reproduction, zygospores formed in one of the conjugating segments	6
5	Primary conidia larger, up to 51 μm	C. utriculosus
–	Primary conidia smaller, less than 36 μm	C. brefeldianus
6	2–4 branches germinated at the top of primary conidiophores	7
–	Unbranched at the top of conidiophores	8
7	Only 2 primary conidia arising from 2 branches, larger, up to 44 μm	C. megalotocus
–	2–4 primary conidia arising from 2–4 branches, smaller, less than 29 μm	C. polytocus
8	Secondary conidiophores branched	9
–	Secondary conidiophores unbranched	10
9	Secondary conidiophores branched almost at the tip, primary conidia larger, up to 40 μm	C. bifurcatus sp. nov.
–	Secondary conidiophores branched at the tip or base, primary conidia smaller, less than 30 μm	C. mycophilus
10	Primary conidia larger, up to 55 μm	11
–	Primary conidia smaller, maximum not over 42 μm	12
11	Primary conidia globose to pyriform, zygospores globose, 26–40 μm	C. macrosporus
–	Primary conidia globose, subglobose, pyriform to oboviod, zygospores not observed	C. variabilis sp. nov.
12	Primary conidia smaller, less than 21 μm	C. khandalensis
–	Primary conidia larger, more than 33 μm	13
13	Two types of resting spores produced: zygospores or chlamydospores	C. humicolus
–	One type of resting spores produced	14
14	Only chlamydospores produced	C. firmipilleus
–	Only zygospores produced	15
15	Primary conidiophores shorter, less than 80 μm	C. gonimodes
–	Primary conidiophores longer, more than 130 μm	16
16	Zygospores globose or elongate, larger, 15–40 × 18–45 μm	C. incongruus
–	Zygospores globose, smaller, 30–36 μm	C. mycophagus
4	Fusiform secondary conidia produced, each zygospore in a position separated by a short, but relatively constant distance from a lateral conjugation outgrowth or beak	C. iuxtagenitus
–	Fusiform secondary conidia not produced, each zygospore in a position not separated by a short, but relatively constant distance from a lateral conjugation outgrowth or beak	17
17	A chain of up to seven undischarged repetitional conidia produced	C. margaritatus
–	No chains of undischarged repetitional conidia produced	18
18	Primary conidiophores produced from cushion mycelia	C. lichenicolus
–	Primary conidiophores not produced from cushion mycelia	19
19	Apical mycelia straight, 2–5 conidia arising from hyphal body, no chlamydospores, zygospores produced	C. taihushanensis sp. nov.
–	Apical mycelia slightly curved, unbranched at the top of conidiophore, chlamydospores produced, no zygospores	C. dabieshanensis