trimerophytes A group of extinct land plants that flourished during the latter part of the Devonian period (380–360 million years ago), members of which evolved into the ancestors of seed plants and ferns. They were robust herbs and small shrubs, some up to 3 m tall, and showed significant changes in branching pattern compared with their predecessors, the rhyniophytes. Instead of equal (dichotomous) branching, one stem tended to be dominant and give rise to smaller lateral branches, some bearing spore-forming organs and others acting as leaves. Moreover, the branching pattern became more regular. This trend culminated in such forms as Pertica quadrifolia, a plant with an obvious main trunk and numerous small lateral branches.
More From encyclopedia.com
Telome Theory , telome theory The theory that the leaves (megaphylls) of ferns and seed plants evolved by the modification of terminal branches (telomes) of stems. I… Branch , branch branch / branch/ • n. a part of a tree that grows out from the trunk or from a bough. ∎ a lateral extension or subdivision extending from the… Stonewort , stonewort The common name for the brittle, calcified plants of the Charophyta; Chara and Nitella are the commonest British genera. The plant consists… Clade , clade Term derived from the Greek klados, a ‘twig’ or ‘branch’. In cladistics, or phylogenetic systematics, it refers to a lineage branch that result… Television producers (Persons) , William Blackwell Branch 1927– Author, playwright, educator, producer, director Acting Led to Writing Career Wrote for Theater and Television Continu… dendritic , dendritic •achromatic, acrobatic, Adriatic, aerobatic, anagrammatic, aquatic, aristocratic, aromatic, Asiatic, asthmatic, athematic, attic, autocrati…
About this article
Updated About encyclopedia.com content Print Article
You Might Also Like