(From Lycopodium 4801 a wolf, and a claw,) muscus clavatus, terrestris, squamosus, plicaria, cingularia, wolf's claw, club moss; lycopodium cla-valum Lin. Sp. Pl. 1564, is a fertile moss, destitute of pedicles and capitella, differing from the selago, because its capsules, instead of being scattered in the sinuses of the leaves, are collected into a club; for each scale covers a kidney shaped and bivalve capsule, which loses no part when ripe. It grows on heaths and hilly places, flowers in July and August, and is reckoned cooling and astringent. Its pollen is sprinkled with advantage on tender skins, to prevent excoriation. M Bucholz, of the academy of Erfurth, has lately examined this singular substance, and found that the seeds contained one-sixteenth of a fat oil, of a brownish yellow colour, soluble in alcohol; a portion of true sugar; an insipid, viscid, brownish yellow extract, leaving a. residuum of peculiar properties, not explained, but which is said to be a peculiar product of the vegetable kingdom. The yellowish appearance of the seeds is supposed to arise from their containing a pigment, and their oil occasions their inflammability and their separation from water. See Plica polonica.