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Exarch protosteles are a defining characteristic of the lycophyte lineage. plectostele – a protostele in which plate-like regions of xylem appear in transverse section surrounded by phloem tissue, thus appearing to form alternating bands. [8] These discrete plates are interconnected in longitudinal section.
Selaginella moellendorffii is a lycophyte that is an important model organism, especially in comparative genomics. S. moellendorffii is a member of an ancient vascular plant lineage that first appeared in the fossil record some 400 million years ago. They would later form a dominant part of the world's flora during the Carboniferous period.
Selaginella canaliculata Selaginella selaginoides Selaginella willdenowii is known for its iridescent colours. There are about 750 known species of Selaginella. [21] They show a wide range of characters; the genus is overdue for a revision which might include subdivision into several genera. [citation needed] Species of spikemoss include:
It is closely related to Selaginella selaginoides which is the only other member in its subgenus. [1] It is endemic to Hawaii and grows primarily in the wet tropical biome [2] from 1,050–1,500 m (3,440–4,920 ft). can be found on all major islands except for Lana'i. [3] It is usually found growing in wet moss.
[2] [3] Lycophytes were some of the dominating plant species of the Carboniferous period, and included the tree-like Lepidodendrales, some of which grew over 40 metres (130 ft) in height, although extant lycophytes are relatively small plants. [4] The scientific names and the informal English names used for this group of plants are ambiguous.
Selaginella selaginoides is a non-flowering plant of the spikemoss genus Selaginella with a wide distribution around the Northern Hemisphere. It resembles a moss in appearance but is a vascular plant belonging to the division Lycopodiophyta .
Selaginella aboriginalis C.Schulz & Homberg Selaginella acanthonota Underw. Selaginella acanthostachys Baker Selaginella achotalensis Shelton & Caluff Selaginella aculeatifolia Valdespino Selaginella acutifolia (Stolze) Valdespino Selaginella adunca A.Braun ex Hieron. Selaginella aenea Warb. Selaginella agioneuma Valdespino & C.López Selaginella aitchisonii Hieron. Selaginella alampeta M ...
Microscopic photo of spores (in red) of Selaginella. The large three spores at the top are megaspores whereas the numerous smaller red spores at the bottom are microspores. Megaspores, also called macrospores, are a type of spore that is present in heterosporous plants. These plants have two spore types, megaspores and microspores.