Vascular Wilts
A culture of Ophiostoma growing on agar in a petri dish. A few pieces of elm wood are also on the plate.
Sporothrix stage. Conidiophores producing conidia.
Synnemata on elm bark as viewed with a hand lens.
Another view of elm wood with synnemata. Conidia collect on the top of each synnema in a sticky droplet.
Microscopic view of the top of a synnema showing a flair of conidiophores that would produce the conidia.
Another view of the top of the synemma showing many conidiophores producing very small conidia. The conidia accumulate in a sticky droplet on the synemma.
A and B strains coming together will result in perithecia forming on the elm wood.
Perithecia have a bulbous base and long neck. Ascospores accumulate on the tip in a sticky matrix.
A perithecium as seen through the microscope with the spore mass oozing out.