Ascospore Release of <i>Togninia minima</i>, Cause of Esca and Grapevine Decline in California

Fig. 5. Cluster of Togninia minima asci stained with Calcofluor White and viewed using fluorescence microscopy. (A) Apical ring that is likely shot or flipped off during forcible ascospore discharge. (B) Ascospores inside an intact ascus.



Image from Plant Health Progress article:
Ascospore Release of Togninia minima, Cause of Esca and Grapevine Decline in California