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A sorus (pl.: sori) is a cluster of ... it may take the form of depression into the thallus. ... the indusium shrivels so that spore release is unimpeded. The ...
The resilient nature of the resting spores, the overwintering sporangia, is the principal challenge in managing the disease. Several means of control have been explored, including chemical [9] [10] and biological, [11] but have been largely ineffective, impractical, or neglected. Cultivation of resistant varieties is the best management approach.
In the Salviniaceae family, the sporocarp is nothing more than a modified sorus, a single cluster of spore-producing tissues enclosed by a thin sphere of tissue and attached to the leaves. In the Marsileaceae (water-clover) family, the sporocarp is a more elaborate structure formed from an entire leaf whose development and form is greatly modified.
The mature sporangia have a wall that is just a single cell thick, [8] and are typically covered with a scale called the indusium, which can cover the whole sorus, forming a ring or cup around the sorus, or can also be strongly reduced to completely absent. Many leptosporangiate ferns have an annulus around the sporangium, which ejects the ...
When a mature fertile frond bears sori, and spores are released, the spores will settle on the soil and send out rhizoids, while it develops into a prothallus. The prothallus bears spherical antheridia (s.g. antheridium) which produce antherozoids (male gametophytes) and archegonia (s.g. archegonium) which release a single oosphere. The ...
Technically, anything over 20 years old can be coined “vintage.”But when you truly think of items worth this title, your brain doesn’t go to Beanie Babies.
An envelope forms around the cluster of sporangia and the cluster becomes a sorus. The sporangia release zoospores that infect other cells. These develop into resting spores that will overwinter. Upon germination, the resting spores function as prosori. [1] Karling included the genus Micromyces within this subgenus [1] while other authors do ...
Hillsdale’s news release on Day of Thanks stated that “ninety-nine percent of undergraduate students at Hillsdale College receive some form of financial aid, with the average financial aid ...