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An annulus in botany is for ferns an arc or a ring of specialized cells on the sporangium. These cells are arranged in a single row, and are associated...

Look up annulus in Wiktionary, the free dictionary. Annulus (or anulus) or annular indicates a ring- or donut-shaped area or structure. It may refer to:...

flower : Orbea variegata" (PDF). Pir.sa.gov.au. Retrieved 24 March 2022. "Annulus (botany)". Cactus-art.biz. Retrieved 15 April 2018. "Orbea variegata". Encyclopedia...

An annulus is the ring-like or collar-like structure sometimes found on the stipe of some species of mushrooms. The annulus represents the remnants of...

growing season. annulus 1.  A ring-like structure; in the form of a ring. Pappus bristles are sometimes attached to a ring called an annulus or disk at the...

the walls of anthers (see above). Many leptosporangiate ferns have an annulus around the sporangium, which ejects the spores. Eusporangiate ferns do...

having an annulus, and anther thecae largely separated, whereas in Haplothismia the 2-6 flowers are borne on pseudoracemes, without annulus, and the anther...

of strawberry to a ringspot virus from raspberry". Canadian Journal of Botany. 41 (6): 865–870. Bibcode:1963CaJB...41..865M. doi:10.1139/b63-070. Descriptions...

straw color to brownish or reddish-brown, becoming darker where injured, annulus absent. Odor: Farinaceous Taste: Farinaceous Microscopic features: Spores...

strongly reduced to completely absent. Many leptosporangiate ferns have an annulus around the sporangium, which ejects the spores. The leptosporangiate ferns...

evanescent and may disappear. Small scales are present on the stem below the annulus. Gills: Crowded, free and remote from the stem with a collar. They are...

Acrostichoid sorus – having sori covering the entire underside; e.g. Acrostichum. Annulus – outer part of the sporangium Elater – Indusium – Marginal – Peltate –...

sterile fronds and lack well-defined sori. Their sporangia have a horizontal annulus that lies below and completely encircles the top of the sporangium. The...

Sporangia in the Osmundaceae are large, and open at a slit on the top; the annulus that drives the sporangium opening is on the side. 128 to 512 spores are...

antemedial line is pale red-brown and there is a small pale red-brown annulus in upper part of the middle of the cell. The reniform is white, defined...

resulting in a shape which "might be called a sector of a right cylindrical annulus (like a piece of pie with the point bitten off)". The blocks fill the color...

some have a tubular shaped corolla. On some species, a raised ring or annulus is present in the center of the corolla. Instead of stamens and pistils...

submedian interspace. There is a small black annulus in the middle of the cell and a larger discoidal annulus. The postmedial line is blackish defined on...

limited. The plants have short-lived spores formed in sporangia lacking an annulus, and borne on a stalk that splits from the leaf blade; and fleshy roots...

to the inner margin. There is a black annulus in the middle of the cell and a narrow elliptical discoidal annulus defined by black. The postmedial line...