thallophyte: any of a group of cryptogamic organisms consisting principally of a thallus and thus showing no differentiation into stem and root and leaf
cryptogam: formerly recognized taxonomic group including all flowerless and seedless plants that reproduce by means of spores: ferns, mosses, algae, fungi
islamic calendar: the lunar calendar used by Muslims; dates from 622 AD (the year of the Hegira); the beginning of the Muslim year retrogresses through the solar year completing the cycle every 32 years