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The Psilophyta contains a genus Psilotum which closely resembles plants like Rhynia. It is essentially a stem that has two interconnected forms. The underground stem (Rhizome) produces Aerial Stems which are Photosynthetic.
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www.biologie.uni-hamburg.de/b-online/library/webb/BOT31...
www.biologie.uni-hamburg.de/b-online/library/webb/BOT311/CellTissOrgan/Psilophyta.htm
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The Aerial Stem is Grooved & Stomata Occupy Grooves & are Sunken, as well. Do these traits have adaptive significance? ... The latter could mean that the Psilophyta are not on the main evolutionary chain leading to flowering plants.
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www.biologie.uni-hamburg.de/b-online/library/webb/BOT20...
www.biologie.uni-hamburg.de/b-online/library/webb/BOT201/PSILOTUM/psilophyta4.htm
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Psilophyta; If we could have wandered about on earth in the Devonian period the only conspicuous land plants would have been something like the whisk fern, Psilotum. It has virtually no leaves and no roots. It has underground stems from which the above ground parts branch off.
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www.hcs.ohio-state.edu/hcs300/svp1.htm
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Division Psilophyta, Genus Psilotum ... Go to Next Page for Lifecycle ... Return to Main Menu Kingdom Plantae...
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home.manhattan.edu/~frances.cardillo/plants/vascular/wh...
home.manhattan.edu/~frances.cardillo/plants/vascular/whiskfrn.html
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Description with links to images of Psilotum nudum and Tmesipteris tannensis. ... Group consisting of two extant genera, Psilotum and Tmesipteris, in one family, Psilotaceae. These plants are primitive in structure: Recent molecular systematic studies suggest that the family is actually related to primitive ferns.
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www.esu.edu/~milewski/intro_biol_two/lab_2_moss_ferns/P...
www.esu.edu/~milewski/intro_biol_two/lab_2_moss_ferns/Psilophyta.html
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Profusely illustrated description focussed on morphology and evolution.
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www.botany.hawaii.edu/faculty/webb/bot201/PSILOTUM/Psil...
www.botany.hawaii.edu/faculty/webb/bot201/PSILOTUM/Psilophyta-1.htm
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Definition of Psilophyta in an online ecyclopedia or dictionary, and discussion about Psilophyta. ... also sometimes as Psilophyta) is a division (ie. phylum) of the Kingdom Plantae. This division contains only two genera: Psilotum, a small shrubby plant of the dry tropics, and Tmesipteris, an epiphyte found in Australia,
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www.knowledgerush.com/kr/encyclopedia/Psilophyta/
www.knowledgerush.com/kr/encyclopedia/Psilophyta/
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Morphology and Life History of Psilotales ... The Psilotales are the least complex of all terrestrial vascular plants, and were once believed to be remnants of an otherwise extinct Devonian flora. This is primarily because psilophytes are the only living vascular plants to lack ... This is a small group with only two genera,
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www.ucmp.berkeley.edu/plants/pterophyta/psilotales.html
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BSA Online Image Collection, Lower Vascular Plants - Psilophyta.
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www.botany.org/plantimages/Lower-Vascual-Plants-PSILOPH...
www.botany.org/plantimages/Lower-Vascual-Plants-PSILOPHYTA.php
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