Abstract
We describe the domatia of nine species of the genus Mortoniodendron, based on observations of cleared leaves and scanning electron micrographs. We recognize four kinds of domatia in Mortoniodendron species: cryptpocket, crypt, pocket and tufts of hairs, mostly associated with primary, secondary and tertiary veins. Mortoniodendron anisophyllum and M. costaricense have domatia up to the tertiary and quaternary veins. Moreover, domatia are absent in only two species, M. pentagonum and M. uxpanapense. Although there are reports on the occurrence of domatia in Malvaceae s.l., mainly in Brownlowioideae, Sterculioideae, and Tilioideae subfamilies, they are poorly described, and based on the different types of domatia found in Mortoniodendron we suggest reviewing other genera to better describe the diversity of domatia in Malvaceae s.l.
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