Other sympatric species are Ptychohyla schmidtorum schmidtorum, which lacks a tarsal fold and nuptial spines and has a red eye in life, Hyla salvadorensis, which has a green dorsum and lacks spinous nuptial tuberosities, and Hyla sumichrasti, a small yellow frog usually lacking vomerine teeth.
"A Review of the Middle American Tree Frogs of the Genus Ptychohyla"
William E. Duellman
The fruiting surface is either in the form of gills like Agaricus, or it is honey-combed, or spinous, or entirely smooth.
"Studies of American Fungi. Mushrooms, Edible, Poisonous, etc."
George Francis Atkinson
From the margins of these bases grow spinous processes of nearly three feet in length, which point upward.
"Popular Adventure Tales"
Mayne Reid