Acervulus
Encyclopedia
An acervulus is a small asexual
fruiting body that erupts through the epidermis
of host plants parasitised
by mitosporic fungi of the form order
Melanconiales (Deuteromycota, Coelomycetes). It has the form of a small cushion
at the bottom of which short crowded conidiophores are formed. The spore
s escape through an opening at the top.
Asexual reproduction
Asexual reproduction is a mode of reproduction by which offspring arise from a single parent, and inherit the genes of that parent only, it is reproduction which does not involve meiosis, ploidy reduction, or fertilization. A more stringent definition is agamogenesis which is reproduction without...
fruiting body that erupts through the epidermis
Epidermis (botany)
The epidermis is a single-layered group of cells that covers plants' leaves, flowers, roots and stems. It forms a boundary between the plant and the external environment. The epidermis serves several functions, it protects against water loss, regulates gas exchange, secretes metabolic compounds,...
of host plants parasitised
Parasitism
Parasitism is a type of symbiotic relationship between organisms of different species where one organism, the parasite, benefits at the expense of the other, the host. Traditionally parasite referred to organisms with lifestages that needed more than one host . These are now called macroparasites...
by mitosporic fungi of the form order
Order (biology)
In scientific classification used in biology, the order is# a taxonomic rank used in the classification of organisms. Other well-known ranks are life, domain, kingdom, phylum, class, family, genus, and species, with order fitting in between class and family...
Melanconiales (Deuteromycota, Coelomycetes). It has the form of a small cushion
Cushion
A cushion is a soft bag of some ornamental material, stuffed with wool, hair, feathers, polyester staple fiber, non-woven material, or even paper torn into fragments. It may be used for sitting or kneeling upon, or to soften the hardness or angularity of a chair or couch...
at the bottom of which short crowded conidiophores are formed. The spore
Spore
In biology, a spore is a reproductive structure that is adapted for dispersal and surviving for extended periods of time in unfavorable conditions. Spores form part of the life cycles of many bacteria, plants, algae, fungi and some protozoa. According to scientist Dr...
s escape through an opening at the top.
Sources
- Trigiano,Robert Nicholas, Mark Townsend Windham, Alan S. Windham. (2004) Plant Pathology: Concepts and Laboratory Exercises. CRC Press. pp.11,129,137.