Table 1. Habitats characteristics of Platanthera bifolia and P. chlorantha studied populations.

REGION	Population	Size (ha)	Habitat	Plant community type	Visibility of Platantherans	Understory cover (%)
SLP (Suwałki LP)	SMOLF	~150	Forest	Fragment of birch-spruce forest surrounded by multispecies meadows in agriculture landscape	Higher than other plants	10–40
	SMOLM	~200	Open	Rich multispecies meadow, grazing	Equal	100
	LIN	~150	Open	Rich multispecies meadow, grazing	Equal	100
	BON	~60	Forest	Hornbeam-oak forest	Higher than other plants	20–70
	POB1	~50	Artificial young forest copse	Artificial dense young spruce community without plants under spruces and with small gaps among tree aggregations dominated by grasses	Higher than other plants	0–100
	POB2	~2-	Artificial young forest copse	Dense young spruce plantation without plants under spruces and with small gaps among tree aggregations dominated by grasses	Higher than other plants	80
BbPN (Biebrza NP)	POG	~50	Open/Forest	Border of peat bogs with single trees and shrubs	Higher than other plants/ equal	80–100
BPN (Białowieża NP)	BF	~70	Forest	Hornbeam-oak forest	Higher than other plants	10–50
	BC	~200	Open	Rich multispecies meadow among forests	Equal	100