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In botany, a sporophyll is a leaf that bears sporangia. Both microphylls and megaphylls can be sporophylls. In heterosporous plants, sporophylls (whether they are microphylls or megaphylls) bear either megasporangia and thus are called megasporophylls, or microsporangia and are called microsporophylls. The overlap of the prefixes and roots ...
stem with microphylls. genus Drepanophycus Göppert microphylls short, tapering rapidly from wide base (thorn-shaped) microphylls arranged spirally or randomly on stem; sporangia borne on upper surface of microphylls; genus Baragwanathia Lang & Cookson microphylls long, not tapering over most of length (strap-shaped) microphylls arranged ...
A sporangium (from Late Latin, from Ancient Greek σπορά (sporá) 'seed' and ἀγγεῖον (angeîon) 'vessel'); pl.: sporangia) [1] is an enclosure in which spores are formed. [2] It can be composed of a single cell or can be multicellular .
Skin flora, also called skin microbiota, refers to microbiota (communities of microorganisms) that reside on the skin, typically human skin. Many of them are bacteria of which there are around 1,000 species upon human skin from nineteen phyla. [1] [2] Most are found in the superficial layers of the epidermis and the upper parts of hair follicles.
The leaves contain a single, unbranched vascular strand, and are microphylls by definition. [6] They are usually arranged in spirals. [ 7 ] The kidney-shaped (reniform) spore -cases ( sporangia ) contain spores of one kind only, ( isosporous, homosporous ), and are borne on the upper surface of the leaf blade of specialized leaves (sporophylls ...
Homosporous sporangia borne singly on the upper leaf surface or in an axillary position. [ 3 ] Drepanophycaceae differs from a related family of the same period, Asteroxylaceae , in having vascularized microphylls ; [ 3 ] see Drepanophycales for more details.
In extinct groups, further protection was afforded to the spores by the presence of whorls of bracts - big pointed microphylls protruding from the cone. The extant horsetails are homosporous, but extinct heterosporous species such as Calamostachys casheana appear in the fossil record. [6] The sporangia open by lateral dehiscence to
Physodermatacae is a family of chytrid fungi in the order Physodermatales. [1] Species in the family have a parasitic relationship with the host's physoderma.This family is distinctive in that it contains a thick wall around the sporangia to resist against unfavorable conditions. [2]