Acrobolbus, Nees, 1844

Burghardt, Michael, 2022, Acrobolbus mashpianus (Acrobolbaceae, Marchantiophyta) sp. nov. from the Northern Andes of Ecuador-Notes on the Bryophytes of Ecuador VII, Phytotaxa 577 (1), pp. 133-138 : 134-135

The Ecuadorian species of Acrobolbus may be keyed out as follows (modified after Gradstein 2021):

1. Leaves strongly asymmetrically bifid with the ventral lobe usually at least twice as wide as the dorsal lobe .................................. 2

1a. Leaves (sub-) symmetrically bifid with the ventral lobe about as wide as the dorsal lobe................................................................ 3

2. Leaves bifid to 1/3, marginal teeth if present triangular.......................................................................................... Acrobolbus laxus

2a. Leaves bifid to 4/5, marginal teeth elongate triangular to ciliate ................................................................. Acrobolbus mashpianus

3. Trigones large and nodulose, leaf lobes ending in a single row of 5–8 cells ..................................................... Acrobolbus setaceus

3a. Trigones small and triangular, leaf lobes ending in a single row of 1–4 cells.................................................................................... 4

4. Leaves on sterile and male shoots often strongly narrowed towards the base, leaves frequently caducous. Female bracts coarsely toothed, with long laciniate or ciliate teeth ................................................................................................... Acrobolbus cuneifolius

4a. Leaves on sterile and male shoots not or little narrowed towards the base, leaves not caducous. Female bracts toothed to subentire .............................................................................................................................................................. Acrobolbus wilsonii