DENDROLOGY

Detailed explanation-1: -Nonvascular plants are made up of mosses, liverworts, and hornworts-all of which belong to the subdivision of plants called Bryophyta or bryophytes. They are described as nonvascular because they do not have an internal transport or circulatory system as do other plants.

Detailed explanation-2: -Mosses and liverworts are small, primitive, non-vascular plants. They lack the conductive tissue most plants use to transport water and nutrients. Instead, moisture is absorbed directly into cells by osmosis.

Detailed explanation-3: -Nonvascular plants (often referred to collectively as the bryophytes) include three groups: the mosses (Bryophyta), approximately 15, 000 species; liverworts (Hepaticophyta), approximately 7500 species; and hornworts (Anthocerophyta), approximately 250 species (Table 1).