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A pteridophyte is a vascular plant (with xylem and phloem) that reproduces by means of spores. Because pteridophytes produce neither flowers nor seeds, they are sometimes referred to as "cryptogams", meaning that their means of reproduction is hidden. They are also the ancestors of the plants we see today.
Ferns and lycophytes share a life cycle and are often collectively treated or studied, for example by the International Association of Pteridologists and the Pteridophyte Phylogeny Group. 23,420 species of vascular plant have been recorded in South Africa, making it the sixth most species-rich country in the world and the most species-rich ...
A prothallus, or prothallium, (from Latin pro = forwards and Greek θαλλος (thallos) = twig) is usually the gametophyte stage in the life of a fern or other pteridophyte. Occasionally the term is also used to describe the young gametophyte of a liverwort or peat moss as well. In lichens it refers to the region of the thallus that is free ...
Polystichum setiferum, a fern Grimmia pulvinata, a moss Pelvetia canaliculata, a brown alga Hypholoma fasciculare, a fungus. A cryptogam (scientific name Cryptogamae) is a plant, in the broad sense of the word, or a plant-like organism that share similar characteristics, such as being multicellular, photosynthetic, and primarily immobile, that reproduces via spores rather than through flowers ...
Left on the plant, each fiddlehead would unroll into a new frond (circinate vernation). As fiddleheads are harvested early in the season, before the frond has opened and reached its full height, they are cut fairly close to the ground. [2] Fiddleheads from brackens contain ptaquiloside, a compound associated with bracken toxicity, and ...
Occasionally has scanned images of the specimen. Jepson Manual online Brief species treatments and distribution within California of species native to that state. NatureServe Explorer Archived 2006-03-15 at the Wayback Machine Conservation status look-ups. Plants for a Future Descriptions of plants with some significant human use. PLANTS database
What they look like: Chiggers, a type of small mite, typically leave clusters of bites that are often very itchy. In many cases, chigger bites appear as small, red and itchy bumps. Sometimes, they ...
A proposed phylogeny of the vascular plants after Kenrick and Crane 1997 [16] is as follows, with modification to the gymnosperms from Christenhusz et al. (2011a), [17] Pteridophyta from Smith et al. [18] and lycophytes and ferns by Christenhusz et al. (2011b) [19] The cladogram distinguishes the rhyniophytes from the "true" tracheophytes, the ...