Psilotum - Wikipedia
网页Psilotum is a genus of fern -like vascular plants. It is one of two genera in the family Psilotaceae commonly known as whisk ferns, the other being Tmesipteris.
Psilotaceae - Wikipedia
网页Psilotaceae is a family of ferns (class Polypodiopsida) consisting of two genera, Psilotum and Tmesipteris with about a dozen species. [1] . It is the only family in the order Psilotales. [2] Description.
Psilophytopsida - Wikipedia
网页Psilophytopsida is a now obsolete class containing one order, Psilophytales, which was previously used to classify a number of extinct plants which are now placed elsewhere.
Psilophytales - Oxford Reference
网页The modern psilophytes (Psilopsida) comprise 4 or 5 plant species of the tropics and subtropics, of which Psilotum (whisk fern) is the best known. From: Psilophytales in A Dictionary of Plant Sciences ». Subjects: Science and …
Psilotales - an overview | ScienceDirect Topics
网页The Psilotales, or psilotophytes (commonly called “whisk ferns”), consist of the single family Psilotaceae, with two genera (Psilotum and Tmesipteris). Like all vascular plants, the whisk ferns have an independent, dominant, free-living sporophyte; the haploid gametophyte is small, obscure, and free-living in or on the soil.
Psilophyta - Oxford Reference
网页A phylum of primitive tracheophyte plants that contains two extant genera – Psilotum (whisk ferns) and Tmesipteris – as well as numerous extinct forms that flourished in the Devonian period. Psilophytes have rhizoids rather than roots; the stems, which show dichotomous branching, may be naked or bear scalelike leaves.
Psilophytales - Encyclopedia.com
网页2018年5月8日 — Psilophytales (psilophytes) Primitive pteridophytes, which were the earliest vascular plants, from the Silurian and the Devonian. They had slender, tapering, leafless or scale-bearing stems up to 50 cm high, often with cone-shaped sporangia (see SPORE) at the top.
Psilotophyta | Encyclopedia.com
网页Psilotophyta (sīlō´tŏf´ətə), division of vascular plants consisting of only two genera, Psilotum and Tmesipteris, with very few species. These plants are characterized by the lack of roots, and, in one species, leaves are lacking also. The green, photosynthetic stem is well-developed.
网页When directing our attention to the fossil record to determine what it can offer regarding the morphology or the taxonomy of the Psilotaceae, it is impor- tant to remember that the family Psilotaceae is composed of two genera, Psilotum and Tmesipteris, and to understand their relationship to one another both should be.
Psilophyte Definition & Meaning - Merriam-Webster
网页The meaning of PSILOPHYTE is any of a division (Psilophyta) of simple dichotomously branched plants that first appeared during the Late Silurian, are now limited to two extant genera, lack true leaves and roots, and include the …