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Mucor spores or sporangiospores can be simple or branched and form apical, globular sporangia that are supported and elevated by a column-shaped columella. Mucor species can be differentiated from molds of the genera Absidia , Rhizomucor , and Rhizopus by the shape and insertion of the columella, and the lack of stolons and rhizoids .
IARC group 3 substances, chemical mixtures and exposure circumstances are those that can not be classified in regard to their carcinogenicity to humans by the International Agency for Research on Cancer (IARC).
The sporangium has an operculum, epiphragm, columella, sporangial jacket, a spore bearing layer, and nematodontous teeth. Nematodontous teeth are composed of whole, thickened dead cells. [ 10 ] Although nematodontous teeth are not hygroscopic , [ 11 ] they may aid in spore dispersal through small movements (they do not move much). [ 9 ]
A columella (pl. columellae) is a sterile (non-reproductive) structure that extends into and supports the sporangium of some species. In fungi, the columella, which may be branched or unbranched, may be of fungal or host origin. Secotium species have a simple, unbranched columella, while in Gymnoglossum species, the
Backusella; Sporangium (i.e. a cluster of sporangiospores surrounding a columella (obscured in image by sporangiospores) subtended by a hypha) viewed with bright-field light microscope
Mortierellomycotina reproduce asexually by sporangia that either lack or have a reduced columella, which support the sporangium. [3] Species of Mortierellomycotina only form microscopic colonies, but some make multicellular sporocarps . [ 15 ]
Mucor plumbeus is a fungus in the family Mucoraceae (subphylum Mucoromycotina) that is very common, abundant and distributed worldwide. [1] [2] Mucor plumbeus is not known to be a plant or animal pathogen; however it is able to elicit an immune response in humans by activating the complement system. [2]
IARC group 2A agents are substances and exposure circumstances that have been classified as probable carcinogens by the International Agency for Research on Cancer (IARC). [1] This designation is applied when there is limited evidence of carcinogenicity in humans, as well as sufficient evidence of carcinogenicity in experimental animals .