Table 5.

Content of ptaquiloside and pterosin B in bracken crosiers from USA (food dehydrator; 24–32 hrs; 35–38 °C; ± standard deviation). The locations are used to collect crosiers in spring (to be used in traditional food).

Location	Ptaquiloside (μg g−1)a	Pterosin B (μg g−1)a	PTAtrans		pH	Light exposure	Soil typec
Site 1:
01A	128 ± 30	262 ± 12	0.20	6.2		Sunny	Loam
01B	218 ± 35	449 ± 1	0.20	5.3		Partial-Shade	Clay
01C	273 ± 72	405 ± 88	0.25	5.2		Full Shade	Not recorded
Site 2:
02A	24 ± 3	49 ± 1	0.20	6.0		Partial-Shade	Sand/Loam/Clay
02B	67 ± 2	57 ± 12	0.37	5.9		Full Shade	Loam/Sand
02C	43 ± 6	42 ± 7	0.34	6.1		Sunny	Loam/Sand
Site 3:
03A	BDb	BD	–	4.4		Sunny	Sand/Clay
03B	BD	BD	–	4.2		Partial-Shade	Sand/Clay
Site 4:
04A	BD	BD	–	4.0		Full Shade	Sand/Clay
Site 20:
20A	BD	BD	–	4.5		Partial-Shade	Silt/Loam
20B	BD	BD	–	4.5		Sunny	Silt/Loam
20C	BD	BD	–	4.6		Full Shade	Silt/Loam
Site 21:
21A	35 ± 2	276 ± 37	0.06	3.9		Full Shade	Silt/Loam
21B	25 ± 0	161 ± 20	0.07	4.3		Sunny	Silt/Loam
21C	71 ± 0	241 ± 10	0.13	4.2		Partial-Shade	Silt/Loam
Site 40:
40A	75 ± 0	62 ± 0	0.38	4.8		Partial-Shade	Sand
40B	67 ± 0	37 ± 0	0.48	4.9		Full Shade	Sand
40C	BD	BD	–	4.7		Sunny	Sand
Site 41:
41A	BD	BD	–	5.2		Full Shade	Loam
41B	BD	BD	–	4.9		Partial-Shade	Sand

^aAs pr. dry weight.

^bBelow Limit of Detection.

^cSoil Survey Staff (2014).