Species present in at least one 1-m2-quadrat of 10 quadrats (in two communities) on Katahdin. Quadrats 1–5 are from the Diapensia heath community; 6–10 from snow bed community. Cover classes defined in Table 1. Averages for taxa by community are presented only in this table and were not used in analyses. Cover recorded using the DOMIN Scale: 0.1 = trace, 1 = few, 2 = several, 3 = many but < 4%, 4 = 4-10%, 5 = 11-25%, 6 = 26-33%, 7 = 34-50%, 8 = 51-75%, 9 = 76-90%, 10 = 91-100%.
Taxon	Abbreviation in Fig. 6	Diapensia-heath						Snowbed
							1-5						6-10 Ave.
		1	2	3	4	5	Ave.	6	7	8	9	10
Crustose Lichens
Aspicilia sp.	―	.	.	.	0.1	.	0.02	.	.	.	.	.	.
Fuscidea lowensis	Fus low	.	.	.	0.1	.	0.02	.	.	.	.	.	.
Lecanora sp.	Lec sp.	.	.	.	1	.	0.2	.	.	.	.	.	.
Lecidea hypnorum	Lec hyp.	.	1	.	.	.	0.2	.	.	.	.	.	.
Micarea peliocarpa	Mic pel	1	.	.	.	.	0.2	.	.	.	.	.	.
Micarea sp.	Mic sp	1	.	.	.	.	0.2	.	.	.	.	.	.
Mycoblastus sanguinarius	Myc san	.	.	.	1	.	0.2	.	.	.	.	.	.
Ochrolechia frigida	Och fri	.	1	1	1	1	0.8	.	.	.	.	.	.
Ophioparma ventosa	Oph ven	.	.	.	0.1	.	0.02	.	.	.	.	.	.
Rhizocarpon geographicum	Rhi geo	.	.	.	0.1	.	0.02	.	.	.	.	.	.
Rhizocarpon sp.	Rhi sp.	.	.	.	0.1	.	0.02	.	.	.	.	.	.
Trapeliopsis granulosa	Tra gra	.	.	1	.	.	0.2	.	.	.	.	.	.
Macrolichens
Arctoparmelia centrifuga	Arc cen	1	.	.	.	.	0.2	.	.	.	.	.	.
Cetraria laevigata	Cet lae	4	4	4	3	3	3.6	4	1	.	3	1	1.8
Cetrariella delisei	Cet del	2	2	3	1	2	2	.	.	.	.	.	.
Cladonia amaurocraea	Cla ama	1	2	2	.	1	1.2	.	.	.	.	.	.
Cladonia arbuscula	Cla arb	1	1	1	2	3	1.6	.	1	.	.	1	0.4
Cladonia boryi	Cla bor	1	3	.	1	2	1.4	.	.	.	.	.	.
Cladonia gracilis	Cla gra	.	.	.	1	.	0.2	1	2	.	.	3	1.2
Cladonia macilenta	Cla mac	.	.	.	2	.	0.4	.	.	.	.	.	.
Cladonia pleurota	Cla ple	.	.	1	.	1	0.4	.	.	.	.	.	.
Cladonia rangiferina	Cla ran	4	2	.	1	1	1.6	1	2	.	.	2	1
Cladonia (squamules)	Cla squ	.	.	1	.	.	0.2	.	.	.	.	.	.
Cladonia stellaris	Cla ste	.	.	1	1	2	0.8	.	.	.	.	.	.
Cladonia stygia	Cla sty	1	1	4	4	4	2.8	5	.	.	.	.	1
Cladonia uncialis	Cla unc	2	3	2	4	2	2.6	.	1	.	.	.	0.2
Flavocetraria cucullata	Fla cuc	1	1	2	1	1	1.2	.	.	.	.	.	.
Flavocetraria nivalis	Fla niv	1		1	1	2	1	.	.	.	.	.	.
Melanelia stygia	Mel sty	.	.	.	1	.	0.2	.	.	.	.	.	.
Stereocaulon alpinum	Ste alp	.	1	1	1	.	0.6	.	.	.	.	.	.
Thamnolia subuliformis	Tha sub	3	3	3	3	3	3	.	.	.	.	.	.
Umbilicaria hyperborea	Umb hyp	.	.	.	1	.	0.2	.	.	.	.	.	.
Hepatics
Barbilophozia kunzeana	Bar kun	.	.	.	.	.	.	.	.	1	3	.	0.8
Cephaloziella sp.	Cep sp1	.	.	.	.	1	0.2	.	.	.	.	.	.
Lophozia ventricosa	Lop ven	.	.	.	.	.	.	.	.	.	2	.	0.4
Ptilidium ciliare	Pti cil	1	.	.	.	.	0.2	7	2	4	6	4	4.6
Mosses
Aulacomnium palustre	Aul pal	.	.	.	.	.	.	.	.	.	.	4	0.8
Dicranum fuscescens	Dic fus	.	.	.	.	.	.	.	3	4	8	10	5
Dicranum polysetum	Dic pol	.	.	.	.	.	.	4	2	.	.	1	1.4
Dicranum scoparium	Dic sco	.	.	.	.	.	.	.	2	.	.	.	0.4
Dicranum sp.	Dic sp	1	.	.	.	.	0.2	.	.	.	.	.	-
Hylocomiastrum umbratum	Hyl umb	.	.	.	.	.	.	.	.	3	.	.	0.6
Hylocomium splendens	Hyl spl	.	.	.	.	.	.	2	.	5	.	.	1.4
Pleurozium schreberi	Ple sch	.	.	.	.	.	.	3	6	4	.	3	3.2
Pohlia nutans	Poh nut	.	.	.	.	.	.	1	.	.	.	.	0.2
Polytrichum juniperinum	Pol jun	1	.	1	1	.	0.6	.	.	8	4	4	3.2
Ptilium crista-castrensis	Pti-cr-ca	.	.	.	.	.	.	.	.	3	.	5	1.6
Racomitrium lanuginosum	Rac lan	1	.	.	.	.	0.2	.	.	.	.	.	.
Racomitrium microcarpon	Rac mic	.	.	.	.	1	0.2	.	2	.	3	.	1
Sanionia uncinata	San unc	.	.	.	.	.	.	.	.	.	3	.	0.6
Sphagnum capillifolium	Sph cap	.	.	.	.	.	.	.	.	.	.	7	1.4
Straminergon stramineum	Str str	.	.	.	.	.	.	.	.	.	3	.	0.6
Vascular Plants
Agrostis mertensii	Agr mer	.	.	.	.	1	0.2	.	.	.	.	.	.
Arctostaphylos alpina	Arc alp	7	.	5	5	6	4.6	.	.	.	.	.	.
Aster macrophyllus	Ast mac	.	.	.	.	.	.	.	3	.	.	.	0.6
Carex bigelowii	Car big	.	3	1	2	4	2	2	3	.	2	3	2
Coptis trifolia subsp. groenlandicum	Cop tri	.	.	.	.	.	.	3	.	3	.	4	2
Cornus canadensis	Cor can	.	.	.	.	.	.	2	.	3	.	3	1.6
Deschampsia flexuosa	Des flex	.	.	.	.	.	.	.	3	5	1	3	2.4
Diapensia lapponica	Dia lap	8	8	5	5	5	6.2	.	.	.	.	.	.
Diphasiastrum sitchense	Dip sit	.	.	.	.	.	.	1	.	3	.	1	1
Empetrum nigrum	Emp nig	.	.	5	3	.	1.6	8	5	6	4	7	6
Harrimanella hypnoides	Har hyp	.	.	.	.	.	.	.	2	.	3	.	1
Juncus trifidus	Jun tri	2	2	.	3	3	2	.	1	.	3	.	0.8
Kalmia polifolia	Kal pol	.	.	.	.	.	.	.	4	2	3	4	2.6
Loiseleuria procumbens	Loi pro	.	.	.	.	5	1.0.	.	.	.	.	.	-
Maianthemum canadensis	Mai can	.	.	.	.	.	.	2	.	1	1	4	1.6
Phyllodoce caerulea	Phy cae	.	.	.	.	.	.	.	5	2	.	3	2
Rhododendron groenlandicum	Rho gro	.	.	.	.	.	.	6	3	4	3	5	4.2
Sibbaldiopsis tridentata	Sib tri	.	.	.	.	.	.	.	3	.	.	1	0.8
Vaccinium angustifolium	Vac ang	.	.	.	.	.	.	6	5	4	.	4	3.8
Vaccinium uliginosum	Vac uli	7	7	7	7	6	6.8	6	7	6	9	7	7
Vaccinium vitis-idaea var. minus	Vac vit	.	.	.	1	3	0.8	4	1	.	.	.	1