Pteridium (bracken; family Dennstaedtiaceae) A monotypic genus (P. aquilinum) of ferns with deep, creeping rhizomes, and much dissected, pinnate fronds. The sori are continuous all round the edges of those pinnae that produce them, and are protected both by the recurved margin of the pinna, and by a delicate indusial flap on their inner side. It is one of the world's most common ferns, and a pest in many pasture lands in temperate climates, since it is not usually eaten by animals and is encouraged by burning. The genus is cosmopolitan, except for the Arctic and temperate S. America.
More From encyclopedia.com
Climatic Geomorphology , Climatic geomorphology Strahler Climate Classification , Skip to main content Strahler climate classification Strahler climate classification A little-used system for describing climates devised in 1969 by… Temperate Climate , temperate climate A mid-latitude climate influenced from time to time by both tropical and polar air masses. Temperature criteria provide subdivision… Round , round / round/ • adj. 1. shaped like or approximately like a circle or cylinder: she was seated at a small, round table. ∎ having a curved shape like… Megathermal Climate , Skip to main content megathermal climate Microclimate , Climate is the set of characteristic temperatures, humidities, sunshine, winds, and other weather conditions that prevail over large areas of space f…
About this article
Updated About encyclopedia.com content Print Article
You Might Also Like