stigmatea

from The Century Dictionary.

• noun A genus of minute parasitic pyrenomycetous fungi, having separate perithecia arising beneath the epidermis of the host, and hyaline or slightly greenish two-celled spores. About 20 species are known. S. Mespili has been suspected of being the ascigerous form of Entomosporium maculatum, which causes leaf-blight of the pear. S. Robertiani occurs on Geranium Robertianum in Europe and America.