Morrisographium ulmi Conidia
on decaying piece of bark of Ulmus on the ground.
This Hyphomycetes is quite distinctive because it produce slender black with a mass of pale conidia protruding from its apex. Macroscopically. This species is very common on bark of Ulmus on the ground, but rarely numerous (This one is an exception with about 50 specimens, however most do not have a conspicuous conidial mass at their apex).
The conidiophore were not observed on this specimen as long dark setae where surrounding them. The conidia are quite fusiform with their apex hooked. The conidia are hyaline, but on some conidia the central cells are slightly dematiaceous. The mature conidia have 7-9 septa, and measure (42)45-53u X 2-3(3.5)u.
This species can confused with M. ulmicola which is also found in the region on the same habitat. However the latter produce conidia reaching 70u with up to 11-13 septa and they are more sigmoid in shape. M. ulmi is also known from other trees, in these condition it can be confused with M. boudieri which have shorter more clavate conidia. Conicomyces are probably macroscopically hardly distinguishable, but they have a long appendage at the end of their conidia.
Morrisographium ulmi Conidia
on decaying piece of bark of Ulmus on the ground.
This Hyphomycetes is quite distinctive because it produce slender black with a mass of pale conidia protruding from its apex. Macroscopically. This species is very common on bark of Ulmus on the ground, but rarely numerous (This one is an exception with about 50 specimens, however most do not have a conspicuous conidial mass at their apex).
The conidiophore were not observed on this specimen as long dark setae where surrounding them. The conidia are quite fusiform with their apex hooked. The conidia are hyaline, but on some conidia the central cells are slightly dematiaceous. The mature conidia have 7-9 septa, and measure (42)45-53u X 2-3(3.5)u.
This species can confused with M. ulmicola which is also found in the region on the same habitat. However the latter produce conidia reaching 70u with up to 11-13 septa and they are more sigmoid in shape. M. ulmi is also known from other trees, in these condition it can be confused with M. boudieri which have shorter more clavate conidia. Conicomyces are probably macroscopically hardly distinguishable, but they have a long appendage at the end of their conidia.