Some environmental factors that contribute to the germination of sores are stress, intake of acid or citrus foods, lesions produced inside the mouth that can leave unhealed wounds, a weakened immune system, a nutritional problem, a gastrointestinal illness or an infection due to wounds that can produce sharp instruments or orthodontics. Also, the oral temperature, slightly higher than the outside temperature, can also contribute to the germination and development of sores.
Severe changes in environmental variables such as high osmotic pressure, low oxygen tension, low or high pH, and low or high temperature interfere greatly with the germination process.
see the links below for more information.
http://onlinelibrary.wiley.com/doi/10.1046/j.1365-2672.1999.00604.x/pdf
https://link.springer.com/article/10.1007%2Fs11515-015-1342-6
https://www.ncbi.nlm.nih.gov/pubmed/427653
https://www.jstor.org/stable/3759456?seq=1#page_scan_tab_contents
http://www.scielo.br/scielo.php?pid=S0102-33062017005002101&script=sci_arttext
http://pubs.sciepub.com/ajmr/4/6/2/
https://www.jstage.jst.go.jp/article/weed1962/41/3/41_3_184/_article
Microbial spore is a minute propagative unit function like a seed,
differing from it because they do not contain a performed embryo sporulation
is the most frequent method of asexual reproduction in fungi spores differ
variously in their structure ranging from globose, oval, oblong helical to
needle shaped and various coloured i.e. hyaline, yellow, green, orange, red
and brown to black. They may be minute to large, unicellular to multicellular,
motile or non motile with a smooth or sculptured thin or thick wall may be
uni, bi or multinucleate
http://shodhganga.inflibnet.ac.in/bitstream/10603/33669/10/10chapter%207.pdf
https://www.jstage.jst.go.jp/article/weed1962/41/3/41_3_184/_article
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