Squamella is a genus of lichenized fungi in the family Cladoniaceae. A monotypic genus, Squamella contains the single species Squamella spumosa. ...
• (n.) A diminutive scale or bractlet, such as those found on the receptacle in many composite plants; a palea.
Squa·mel'la noun ; plural Squamellæ . [ New Latin , dim. from Latin squama a scale.] (Botany) A diminutive scale or bractlet, such as those found on the receptacle in many composite plants; a palea. 
Very small squama or scale.