Search results
Results from the WOW.Com Content Network
As a result, the ascus will contain four pairs of spores. Then the ascospores are released from the ascus. In many cases the asci are formed in a regular layer, the hymenium, in a fruiting body which is visible to the naked eye, here called an ascocarp or ascoma. In other cases, such as single-celled yeasts, no such structures are found.
There are 2000 identified genera and 30,000 species of Ascomycota. The unifying characteristic among these diverse groups is the presence of a reproductive structure known as the ascus, though in some cases it has a reduced role in the life cycle. Many ascomycetes are of commercial importance.
Countless of asci form inside each fruiting body, which are then ejected into the outside world through the hole at the tip of the fruiting body. The asci formed inside the fruiting body is elongated and cylindrical, with a dome-shaped structure called the "apical cap" at the tip. Eight spores are formed inside each ascus.
Recent figures indicate that there are more than 1.4 billion insects for each human on the planet, [27] or roughly 10 19 (10 quintillion) individual living insects on the earth at any given time. [28] An article in The New York Times claimed that the world holds 300 pounds of insects for every pound of humans. [28]
A basidium usually bears four sexual spores called basidiospores. Occasionally the number may be two or even eight. Each reproductive spore is produced at the tip of a narrow prong or horn called a sterigma (pl. sterigmata), and is forcefully expelled at full growth. The word basidium literally means "little pedestal". This is the way the ...
Although most species are terrestrial, there are some semi-aquatic species, with representatives from both fresh and salt water. [39] As of 2015, there were 26 known marine Verrucariaceae, distributed amongst the genera Hydropunctaria (6 species), Mastodia (1 sp.), Verrucaria (16 spp.), and Wahlenbergiella (3 spp.). [60]
The generic name polyascus (poly "many" + ascus "bag") refers to the typical presence of multiple external sac-like female bodies, known as externae. In Polyascus species, these originate from asexual reproduction. [1]
The World Organization of the Scout Movement (WOSM / ˈ w ʊ z əm /) is the largest international scout organization and was established in 1922. [ 1 ] [ 2 ] It has 176 members. [ 3 ] These members are national scout organizations that founded WOSM or have subsequently been recognised by WOSM, which collectively have around 43 million ...