Notothylas

Notothylas
Scientific classification Edit this classification
Kingdom: Plantae
Division: Anthocerotophyta
Class: Anthocerotopsida
Order: Notothyladales
Family: Notothyladaceae
Genus: Notothylas
Sull.
Species

Notothylas anaporata
Notothylas breutelii
Notothylas chaudhurii
Notothylas dissecta
Notothylas flabellata
Notothylas himalayensis
Notothylas indica
Notothylas japonicus
Notothylas javanicus
Notothylas khasiana
Notothylas levieri
Notothylas orbicularis
Notothylas pandei
Notothylas pfleidereri

Notothylas is a genus of hornworts in the family Notothyladaceae. The genus is found globally, but is usually overlooked. It is the smallest of all the hornworts, with a yellow-green gametophyte thallus that is seldom more than a centimeter in diameter, and usually much smaller.

The genus Notothylas is also unusual among hornworts in that the sporophyte is bullet-shaped and does not grow very large (less than two millimeters). The sporophytes grow outwards rather than upwards, and like Megaceros, there are no stomata on the surface of the sporophyte. The elater cells do not grow helical thickenings.

Unlike many hornworts, species in Notothylas tolerate full sunlight.[1]

A number of classification systems place Notothylas in its own order Notothyladales (frequently misspelled Notothylales in the literature). This classification is based on the assumption that the unique physical characteristics of the genus reflect an early divergence from other hornworts. However, this assumption is not supported by either phylogenetic analysis or fossil evidence.[2] More recent classifications expand the definition of the family Notothyladaceae to include four other genera.

References

  1. ^ Module-Lower-Plants.pdf - Benson Idahosa University
  2. ^ Duff, R. Joel; Villarreal, Juan Carlos; Cargill, D. Christine; Renzaglia, Karen S. (2007). "Progress and challenges toward developing a phylogeny and classification of the hornworts". The Bryologist. 110 (2): 214–243. doi:10.1639/0007-2745(2007)110[214:PACTDA]2.0.CO;2.
  • Asthana, A. K. & Srivastava, S. C. (1991). Indian Hornworts (A Taxonomic Study). J. Cramer: Bryophytorum Bibliotheca, Band 42. ISBN 3-443-62014-0.
  • Hässel de Menendez, G. G. (1988). A proposal for a new classification of the genera within the Anthocerotophyta. J. Hattori Bot. Lab. 64: 71-86.
  • Hicks, Marie L. (1992). Guide to the Liverworts of North Carolina. Durham, NC: Duke University Press. ISBN 0-8223-1175-5.
  • Prihar, N. S. (1961). An Introduction to Embryophyta, Volume I. Allahbad: Central Book Depot.
  • Singh, D. K. (2002) "Notothylaceae of India and Nepal(A Morpho-taxonomic revision). Bishen Singh Mahendra Pal Singh, Dehradun. ISBN 8121103304

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