By suitable combinations of eosin and cherry most of the cases of polymorphism in butterflies may be simulated.
"Sex-linked Inheritance in Drosophila"
Thomas Hunt Morgan Calvin B. Bridges
From what is now known of the polymorphism of fungi, there would be little difficulty in believing that cells resembling yeast cells would develop into Penicillium, as they do in fact in what is called the "vinegar plant," and that the capsuliferous, or higher condition of this mould may be a Mucor, in which the sporules are produced in capsules.
"Fungi: Their Nature and Uses"
Mordecai Cubitt Cooke
It is chiefly amongst the microscopic species that polymorphism has been determined.
"Fungi: Their Nature and Uses"
Mordecai Cubitt Cooke