Megalastrum vastum is found in forests throughout the tropical Andes from Venezuela to Bolivia between 400 and 2200 m. The large divided leaves covered in short appressed pale hairs, and lack of an indusium help characterize the species.
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- Abaxial leaf surface
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- Adaxial leaf surface
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- Adaxial leaf surface
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- Adaxial leaf surface
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- Habit
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- Adaxial leaf surface
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- Lower petiole scales
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- Adaxial leaf surface. Notice the vein serving the basal basiscopic pinnule emerges from the mid-rib rather than the costa. This venation is characteristic of Megalstrum
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