Spores (5 mg) ofB. spicantL. obtained from sporophytes
growing in the forest of Turo´n (Asturias, Spain) were
soaked in water for 2 h, and then sterilized for 10 min with
a solution of NaClO (0.5%) containing Tween-20 (0.1%).
Subsequently, they were rinsed thrice with sterile distilled
water and centrifuged at 2,000 rpm for 3 min between the
rinses, and cultured in 500 ml Erlenmeyer flasks containing
100 ml full-strength Murashige and Skoog (MS) (1962)
liquid medium supplemented with (a) 4.44 lM BAP, (b) a
crude extract from 0.5 fresh weight mature female gametophytes, and (c) 4.44 lM BAP plus the crude extract,
respectively.