The usual Xylaria has a white, sterile, central portion known as the stroma, bearing a carbonous crust.
The perithecia are arranged in a circle neat the apex of the stroma.
When pus forms it may infiltrate the stroma of the gland, or may be collected into several small foci.
It is formed of a core of stroma and a covering of epithelium.
The follicular epithelium is much thicker on the side adjoining the stroma than on the upper side of the ovum.
The stroma is generally scanty and rich in cells, but it may be abundant.
As the disease progresses, the stroma of the iris atrophies and contracts.
Where the iris tissue lies in contact with the cornea, the stroma of the iris almost totally disappears.
The layer of stroma below the superficial epithelium forms in the mammalian ovary the tunica albuginea.
A perithecium, or cell excavated in the stroma which fulfils the functions of a perithecium, is always present.
stroma stro·ma (strō'mə)
n. pl. stro·ma·ta (-mə-tə)
The connective tissue framework of an organ, a gland, or other structure, as distinguished from the tissues performing the special function of the organ or part.
The spongy and colorless framework of a cell.