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Spore germination of ferns is known to be regulated by a variety of factors; light,1,2) temperature, water and chemical sub stances.3,4) The spore germination in Lygodium japonicum is controlled by phytochrome and a blue light-absorbing pigment.2) This communication deals with the iden tification of linolic and (+)-8-hydroxy hexadecanoic acids as endogenous inhibitors for spore germination in L. japonicum. Isolations of (+)-cis, trans-abscisic acid together with a trace of trans, trans-abscisic acid are also reported. Twenty four g of dormant spores of L. japonicum (Thunb.) Sw. collected at the Koishikawa Botanical Garden of the University of Tokyo in the fall of 1977 were extracted with 200 ml of 50% aqueous acetone overnight and then 200 ml of methanol twice. The combined extracts were concentrated in vacuo and separated into an ethyl acetate soluble-bicarbonate insoluble (Fraction ‡T) and an ethyl acetate soluble-bicarbonate soluble

agricultural and biological chemistry

Endogenous inhibitors for spore germination in Lygodium japonicum and their inhibitory effects on pollen germinations in Camellia japonica and Camellia sinensis.