The spreading habit of the branching, or the form of the caps, suggests an umbel or umbrella, and hence the specific name umbellatus.
"Studies of American Fungi. Mushrooms, Edible, Poisonous, etc."
George Francis Atkinson
Flowers yellow, in a sort of umbel, with 3 or more flowerets on long peduncles.
"The Medicinal Plants of the Philippines"
T. H. Pardo de Tavera
Flowers in a sort of umbel.
"The Medicinal Plants of the Philippines"
T. H. Pardo de Tavera