Mosses moss small flowerless plants plant grow dense green clumps clump mat mats damp shady one-cell thick leaves leave covering cover thin stem water nutrients vascular tissue environment sunlight photosynthesis wooded area edges dampness lichens lichen hornworts hornwort liverworts liverwort bryophytes bryophyte spores spore seeds seed haploid gametophyte phylum division bryophyta garden decorative insulation macro green grass absorb shrubs bushes microscopic slider cinematic nature natural vegetable herb plant weed hay art craft trade profession artifice