Opegrapha prosodea

My third Opegrapha under the microscope today. This one found on a Yew tree in Somerset. It keyed out well for Opegrapha prosodea:

• Photobiont present
• Thallus without soredia and apothecia present
• Ascospore 12-septate
• Apothecia remaining slit like
• Apothecia 1-3mm long and ascospores 52.5µm x 7.5µm

Opegrapha prosodea

Opegrapha prosodea spore 12-septate 52.5µm long

Opegrapha prosodea