Description: L 46.6–48.2um, Br 28.4–29.8um, Isth 13.1–14.0um, L:Br 1.6. There is some confusion in the literature between C. isthmium and C. excavatum f. duplo-major P. Lundell (see Kouwets 1997, p.44 uncer C. horizontale (Schmidle) Kouwets and also Prescott et al. 1981, p. 163). The cells here have a wider and deeper constirction than C. excavatum, with more granules and are about half the size. They are consistent with the species as circumscribed by West & West (1908, p. 145, pl. 77, figs 7–10). (Dingley 2001)

State distribution in Australia, based on available literature

new record for australia (Dingley 2001)

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