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Uredo is a genus of rust fungi: long considered incertae sedis in the order Pucciniales, but now placed in the family Pucciniaceae. [2] This long-established genus, together with the closely-related Uromyces (which some authorities consider to be synonymous), give their names to "uredo-type" fungal spore structures such as "urediniospore" and uredinium".
Urediniospores of 11 Milesina species. a Milesina blechni on Struthiopteris spicant b Milesina blechni on Struthiopteris spicant, cracked spore with released plasma, germ pores scattered c Milesina carpatica on Dryopteris filix-mas d Milesina exigua on Polystichum braunii, smooth surface e Milesina exigua on Polystichum braunii, smooth surface, plasma-free spore, germ pores bipolar f Milesina ...
The leaf discoloration is due to fungal structures called sori, which are clusters of spore-bearing structures. During sporulation, sori burst through leaves releasing teliospores and cause leaves to appear tattered. [3] These spores are reddish brown, smoothly rounded, and they tend to be in clumps of 5-6 with sterile cells around them. [6]
Pustules develop on the leaves early in the season appearing as small creamy yellow spots. The spores produced in the pustules are aeciospores and spread the disease throughout the plant by wind. When these spores are released they are deposited as yellow powder. The aeciospores are found in chains of 7-8 spores and are sessile. [4]
Many exposed to the fungal spores that cause blastomycosis won't even get sick. Some will have mild symptoms that go away. And then there are others.
The fungus was first described scientifically in 1884 as Puccinia psidii by G. Winter, [13] then described again in 2006 as Uredo rangelii by mycologists J.A. Simpson, K. Thomas, and Cheryl Grgurinovic. [14] Finally in 2017 the names were synonymised by Beenken in a new genus as Austropuccinia psidii [1].
It starts with a pile of soy pulp, which is wrapped in banana leaves and sprinkled with the spores of a fungus called Neurospora intermedia. The bundle is left to ferment in a warm, humid place ...
Zoospores are naked (wall-less), kidney-shaped and bi-flagellate. Both flagella are inserted laterally. Thick-walled sexual spores, called oospores are produced which germinate, producing either vesicles inside the plant tissue, exit tubes with vesicles at the tip, or germ tubes. Further zoospores develop inside the vesicles.