Complex sentence: Fruit-bodies (ascomata) are large, more or less spherical to turbinate (like a top), thick-walled, solid; the asci are formed in marbled veins interspersed with sterile tissue.
Split into simpler sentences: Fruit-bodies (ascomata) are large, more or less spherical to turbinate (like a top), thick-walled, and solid. The asci are formed in marbled veins interspersed with sterile tissue.