Table S3.

Bryophyte C/P ratios from literature review (molar ratios given to two significant figures given uncertainty in input data, except where authors provide more precise values)

Species/identifier	N	Mg P/g biomass	Mg C/g biomass	C/P mass	C/P molar	Ref.
Aulacomnium spp.	6	0.8	430*	540	1,400	80
Polytrichum spp. + Pogonatum spp	6	0.7	430*	610	1,600	80
Aulacomnium turgidum		1	430*	430	1,100	81
Hylocomium splendens		0.9	430*	480	1,200	81
Aulacomnium turgidum	4	1.2	430*	360	920	82
Hylocomium splendens	4	1.1	430*	390	1,000	82
Sphagnum rubrum	4	0.8	430*	540	1,400	82
Bryophyte tussock site		1	430*	540	1,400	83
Bryophyte shrub site		0.8	430*	330	850	83
Bryophyte wet site		1.3	430*	310	790	83
Bryophyte heath site		1.4	430*	860	2,200	83
Sphagnum spp.	43	0.56	430*	770	2,000	84
Warnstorfia fluitans		0.5–2.4	410–470	550–950	1,400–2,400	85
12 species across altitudes and soil ages		0.33–0.63		729–1,550	1,900–4,000	86
Sphagnum spp.		0.6–0.8		700–1,000	1,800–2,600	87
Sphagnum spp. foliage				794	2,050	34
Sphagnum spp. litter				911	2,350	34
Sphagnum spp. peat				1285	3,310	34
Sphagnum meadow		1		515	1,330	88
Sphagnum mesotrophic fen flark		1.6		414	1,070	88
Sphagnum mesotrophic fen hummock		0.8		733	1,890	88
Sphagnum oligotrophic fen flark		0.6		722	1,860	88
Sphagnum oligotrophic fen hummock		0.5		999	2,580	88
Sphagnum fen-bog transition flark		0.4		1,376	3,550	88
Sphagnum fen-bog transition hummock		0.3		1,655	4,270	88

^*Mean value across six bryophyte species from ref. 89.