Chasmatophyllum musculinum leaf spots
Author: Ivan Lätti
Photographer: Judd Kirkel Welwitch
The whitish leaf spots of Chasmatophyllum musculinum appear translucent. Such spots can scatter intense sunlight and reduce leaf surface temperature, minimising light damage. There may also be substances in these spots that deter herbivores from overindulging. Leaf hydration may be increased from rough surface spots.
The pedicel length of the yellow flower in picture is notable (Frandsen, 2017; Smith, et al, 1998; iNaturalist; https://www.worldfloraonline.org).