TABLE 1.

Characteristics of isolated acidophilic methanotrophs.

Genus and species	Source	Optimum pH	Optimum temperature range (°C)	MMO expressed	Phenotype	Multi‐carbon substrate	Phylogenetic affiliation	Formaldehyde assimilation	Reference
Methylocella palustris	Sphagnum peat bogs	5.0–5.5	15–20	sMMO	Obligate		α‐Proteobacteria	Serine	Dedysh et al. (2000)
Methylocella siverstris	Forest cambisol	5.5	15–25	sMMO	Facultative	Organic acids, Alcohols, Ethane, Propane	α‐Proteobacteria	Serine	Dunfield et al. (2003)
Methylocella tundrae	Sphagnum tundra peatlands	5.5–6.0	15	sMMO	Facultative	Organic acids, Alcohols	α‐Proteobacteria	Serine	Dedysh et al. (2004)
Methylocapsa acidiphila	Sphagnum peat bogs	5.0–5.5	20–24	pMMO	Obligate		α‐Proteobacteria	Serine	Dedysh et al. (2002)
Methylocapsa aurea	Forest soil	6.0–6.2	25–30	pMMO	Facultative	Acetate	α‐Proteobacteria	Serine	Dunfield et al. (2010)
Methylocapsa palsarum	Collapsed palsa soil	5.2–6.5	18–25	pMMO	Obligate		α‐Proteobacteria	Serine	Dedysh, Didriksen, et al. (2015), Dedysh, Naumoff, et al. (2015)
Methylocystis heyri	Sphagnum peat‐bog lake	5.8–6.2	25	pMMO and sMMO	Facultative	Acetate	α‐Proteobacteria	Serine	Dedysh et al. (2007)
Methylocystis bryophila	Sphagnum peat‐bog lake	6.0–6.5	25–30	pMMO and sMMO	Facultative	Acetate	α‐Proteobacteria	Serine	Belova et al. (2013)
Methyloferula stellate	Sphagnum peat bogs	4.8–5.2	20–23	sMMO	Obligate		α‐Proteobacteria	Serine and RuMP	Vorobev et al. (2011)
Methylomonas paludis	Sphagnum peat bogs	5.8–6.4	20–25	pMMO	Obligate		γ‐Proteobacteria	RuMP	Danilova et al. (2013)
Methylacidiphilum fumariolicum	Acidic thermal mudpot	0.8–6.0	40–65	pMMO	Facultative	Propane, Ethane	Verrucomicrobia		Schmitz et al. (2021)
Methylacidiphilum infernorum	Acidic thermal soil	1.0–6.0	40–60	pMMO	Obligate		Verrucomicrobia		Schmitz et al. (2021)
Methylacidiphilum kamchatkense	Acidic thermal spring	2.0–5.0	37–60	pMMO	Obligate		Verrucomicrobia		Islam et al. (2016)
Methylacidimicrobium cyclopophantes	Acidic soil	0.6–5.5	44–49	pMMO	Obligate		Verrucomicrobia		van Teeseling et al. (2014)
Methylacidimicrobium fagopyrum	Acidic soil	0.6–5.5	35–39	pMMO	Obligate		Verrucomicrobia		van Teeseling et al. (2014)
Methylacidimicrobium tartarophylax	Acidic soil	0.5–5.5	38–43	pMMO	Obligate		Verrucomicrobia		van Teeseling et al. (2014)

Abbreviations: pMMO, particulate CH₄ monooxygenase; sMMO, soluble CH₄ monooxygenase; RuMP, ribulose monophosphate.