WebIntroduction. Notholaena rigida is a Mexican endemic with an oddly disjunct distribution. Plants of extreme northeastern Mexico (Tamaulipas and Nuevo Leon) are slightly larger than those of Chiapas, in extreme southern Mexico; the species is not known to occur elsewhere. Plants of the two areas differ in other ways (northern individuals have ... WebNotholaenids are a clade of xeric-adapted ferns commonly characterized by the presence of a waxy exudate, called farina, on the undersides of their leaves. Although some other lineages of cheilanthoid ferns also have farinose sporophytes, previous studies suggested that notholaenids are unique in also producing farina on their gametophytes.
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WebIntroduction. Notholaena standleyi is one of the most striking ferns of Mexico and the southwestern US (Arizona, Colorado, New Mexico, Oklahoma, Texas). It is locally common … WebMay 1, 2024 · The major constituent of the yellow frond exudate of the fern Notholaena sulphured was identified by spectroscopic methods as 3,5,2′-trihydroxy-7-methoxy-8-acetoxy flavone and its structure was ... how does skin act as a barrier
Ferns -- identification guide -- Discover Life
WebSep 1, 2024 · One particularly remarkable subgroup of cheilanthoid ferns is the notholaenids (sensu Rothfels et al., 2008), a clade centered in the deserts of Mexico and the southwestern United States that comprises the genus Notholaena (sensu Yatskievych and Smith, 2003) and a few other species. Unlike most ferns, the leaves of notholaenids tend to be ... Individuals of this species have brown petioles and green fronds. The ferns are erect and grow to a height of 25 centimetres (9.8 in). The petioles grow to a length of 5 to 13 centimetres (2.0 to 5.1 in). The individual fronds are usually 3 to 7 centimetres (1.2 to 2.8 in) wide as well as long. The frond is light green when young, becoming darker green as it matures, and usually contains five blades arranged in a pentagonal fashion. The blades are bipinnately or tripinnately compound, a… WebNotholaena standleyi Maxon. (for Paul Carpenter Standley, 1884–1963, American botanist at Field Museum of Natural History and author of Trees and Shrubs of Mexico) Local names: star cloak fern, star fern. Leaves to 30 cm long; leaf blades broadly pentagonal, 1-pinnate-pinnatifid, deeply pinnatifid but not completely pinnate above base ... how does skewness differ from dispersion