When a nematode comes in contact with a droplet, they become encased in it, and their motion is completely inhibited. The mycelium of this species grows secretory cells the protrude outwards and develop branches that produce the substance in small droplets. septentrionalis was the first observed species fungus not in the genus Agaricus to secrete a toxin that it uses to immobilize and kill fungiphagous nematodes. septentrionalis is found on the trunks of living and recently deceased trees, especially beech ( Fagus) and maple ( Acer) species. This species is native to northeastern North America, ranging from southern Canada to Kentucky, and as far west as the Great Plains. They can be found in the summer months and are a common cause of heart rot in hardwood trees in their native range. septentrionalis is edible but not palatable due to its tough flesh and bitter taste. The underside of the cap has many white spines (see left) that reach 1 cm in length and also yellow with age. The surface of the cap can be rough or even hairy, and can have concentric rings radiating out from the base. Although, the caps tend to persist for multiple weeks, allowing algae to grow, giving them a slightly green appearance. Young caps range from mostly white to a yellow-cream color, and slowly become a yellow-brown as they age. They typically occur in large groups that can reach 80 cm in height. Individual caps are semicircular or kidney-shaped and can reach up to 30 cm across and 2.5-5.0 cm at the base.
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