Inoperculate ascus 
Operculate Ascus:
INOPERCULATE DISCOMYCETES : ascus unitunicate and inoperculate. three orders: Helotiales; Phacidiales; Ostropales.
Comparison of an INOPERCULATE ascus WITH an OPERCULATE ascus
Inoperculate ascus
Operculate Ascus:
| feature | operculate ascus | inoperculate ascus |
|---|---|---|
| ascus tip | with operculum or bilabiate | neither |
| symmetry of spore | radially symmetrical bilaterally symmetrical | bilaterally symmetrical |
| size of spore | 10-20 x 8-15microns L/D < 5 | L/D > 5.0 |
| number of
rows of spores | one | one to many |
| amyloid reaction | - or if +, 1/2 of ascus | - or if +, limited to pore |
| ascocarp | smallish
to very large | typically smallish |