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==== Asexual spores ==== Different types of asexual spores can be identified by colour, shape, and how they are released as individual spores. Spore types can be used as taxonomic characters in the classification within the Ascomycota. The most frequent types are the single-celled spores, which are designated ''amerospores''. If the spore is divided into two by a cross-wall ([[septum#In mycology|septum]]), it is called a ''didymospore''. {| align="right" cellspacing="0" cellpadding="0" |[[File:Trichoderma aggressivum.jpeg|thumb|right|250px|Conidiospores of ''Trichoderma aggressivum'', diameter approx. 3ΞΌm]] |- |[[File:Aspergillus.jpg|thumb|right|250px|Conidiophores of molds of the genus ''Aspergillus''; conidiogenesis is blastic-phialidic]] |- |[[File:Trichoderma harzianum.jpg|thumb|right|200px|Conidiophores of ''[[Trichoderma harzianum]]''; conidiogenesis is blastic-phialidic]] |- |[[File:Trichoderma fertile.jpg|thumb|right|200px|Conidiophores of ''Trichoderma fertile'' with vase-shaped phialides and newly formed conidia on their ends (bright points)]] |} When there are two or more cross-walls, the classification depends on spore shape. If the septae are ''transversal'', like the rungs of a ladder, it is a ''phragmospore'', and if they possess a net-like structure it is a ''dictyospore''. In ''staurospores'' ray-like arms radiate from a central body; in others (''helicospores'') the entire spore is wound up in a spiral like a spring. Very long worm-like spores with a length-to-diameter ratio of more than 15:1, are called ''scolecospores''.
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