delicately filamentous
• (a.) Byssuslike; consisting of fine fibers or threads, as some very delicate filamentous algae.
Bys·sa'ceous adjective [ From Byssus .] (Botany) Byssuslike; consisting of fine fibers or threads, as some very delicate filamentous algæ. 
byssaceous Byssuslike; consisting of fine fibers or threads, as some very delicate filamentous algae.