COVID19-SLT-HND1 MICROBIOLOGY – MYCOLOGY
COURSE TITLE: MYCOLOGY
Different Types of Asexual Spores in Fungi
Asexual spores are produced by an individual fungus through mitosis and subsequent
cell division; there is no fusion of the nuclei of cells. Asexual reproduction (Also called
somatic or vegetative reproduction) does not involve the union of nuclei, se cells or sex
organs. It may be
Fission of somatic cells yielding two similar daughter cells
Budding of somatic cells or spores, each bud being a small outgrowth of present cell
developing into a new individual
Fragmentation or disjointing of the hyphal cells, each fragment becoming a new
Several forms of asexual spores are produced by fungi, Asexual spores, whose function is to disseminate the species are produced in large numbers. Examples of such spores include:
- Sporangiospores: These single-celled spores are formed within sacs called sporangia
(Singular, sporangium) at the end of special hyphae e.g. Rhizopus. Aphanospores are
non-motile sporangiospores, their motility is due to the presence of flagella).
- Conidiospore: This is a unicellular or multicellular spore that is not enclosed in a sac.
Conidiospores are produced in a chain at the end of a conidiophore. Small, single-celled
conidia are called microconidia while large, multicellular conidia are called
macroconidia. Conidia are formed at the tip or side of a hypha. e.g Penicillin.
- Oidia (Singular, Oidium) or Arthrospores. These single-celled spores are formed by
disjointing of hyphal cells or by fragmentation of a septate hypha into single, slightly
thickened cells. One species
that produces such spores is Coccidiodes immitis.
- Chlamydospores: These are thick-walled spores formed as segments within a hypha.
Chlamydospores are highly resistant to adverse conditions and are formed from cells of
the vegetative hyphae e.g. Candida albicans.
- Blastospores: These are spores formed by budding. These spores often come off the parent cell (e.g. yeast).
of asexual spores
Sporangiospores are formed within a sporangium (spore sacs)
Blastospores are formed from buds of the parent cell.
Fragmentation of hyphae results in the formation of arthrospores
Chlamydospores are thick-walled cells within the hyphae
Conidiospores are arranged
in chains at the end of a conidiophore
Fungi reproduce asexually by spores which include sporangiospores, conidiospores,
chlamydiospores and blastospores.
Asexual reproduction in fungi is usually with the aid of spores. Asexual reproduction in fungi does not involve the union of nuclei of sex cells or gametes or sex organs. The asexual spores are produced in very large numbers to enhance the dissemination of species in either of the
different kinds of asexual spores such as sporangiospores, conidiospores oidia,
chlamydospores, and blastospores.
List the different types of asexual spores in fungi
How is asexual reproduction accomplished by fungi?
Explain different types of reproduction in fungi
The role of the mycelium in reproduction of fungi
The different types of asexual spores
How asexual reproduction occurs in fungi