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Once mature the elastic ring briefly expands and lets the spores shoot out. This type appears both in apothecia and in perithecia; an example is the illustrated Hypomyces chrysospermus. Ascus of Saccharomyces cerevisiae containing a tetrad of four spores. A bitunicate ascus is enclosed in a double wall. This consists of a thin, brittle outer ...
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 ), it is called a didymospore .
Here the fertile layer is free, so that many spores can be dispersed simultaneously. The morel, Morchella, an edible ascocarp, not a mushroom, favored by gourmets, is a mass of apothecia fused together in a single large structure or cap. The genera Helvella and Gyromitra are similar.
Ascomycota life cycle and morphology The phylum Ascomycota , or sac fungus , is characterized by formation of meiotic spores called ascospores enclosed in a special sac called an ascus . The genetic components for sexual reproduction appear to be produced by all members of this group.
Saccharomycotina is a subdivision (subphylum) of the division (phylum) Ascomycota in the kingdom Fungi. [2] [3] It comprises most of the ascomycete yeasts.The members of Saccharomycotina reproduce by budding and they do not produce ascocarps (fruiting bodies).
Gelasinospora as a genus is made up of perithecial fungi, meaning that they discharge their ascospores through an ostiole. Spores do not germinate easily, needing a treatment of temperature, chemicals or a combination of the two to initiate germination. Like most ascomycetes, Gelasinospora species typically have 8 spores in each ascus.
Some of them, however, are known to have a teleomorph (sexual state) in the Ascomycota. With DNA evidence, all members of the genus Aspergillus are members of the phylum Ascomycota. [citation needed] Members of the genus possess the ability to grow where a high osmotic pressure exists (high concentration of sugar, salt, etc.).
Neurospora crassa is a type of red bread mold of the phylum Ascomycota. The genus name, meaning 'nerve spore' in Greek, refers to the characteristic striations on the spores. The first published account of this fungus was from an infestation of French bakeries in 1843. [1]