pulvinulus
/pʌlˈvɪnjʊləs/noun
1 Botany. In certain lichens, especially ones of the genus Parmelia: any of a number of spongy, sometimes highly branched, outgrowths arising from the thallus. rare.
2 Botany = pulvinule. rare.
Origin
Early 19th century; earliest use found in John Loudon (1783–1843), landscape gardener and horticultural writer. From scientific Latin pulvinulus from classical Latin pulvīnulus from pulvīnus cushion, pillow + -ulus.