sentences:  The cells attached to the upper part of the ascomata that resemble hairs are known as "penicillate cells"; they are made of foots and filaments.The filaments can gelatinize by absorbing water and are thought to function in helping the ascomata adhere to the surface on which they grow, like the underside of leaves.In "P. guttata", the foots are cylindrical, irregular in width, 32–72 by 7.5–25 μm, and divided into 2–10 branchlets in the upper part.