Protoperithecia formation occurs in environments of low nitrogen The protoperithecium will act as the female gamete as the recipient of a nucleus while the conidium which will act as the male gamete donating a nucleus.
22.
A germ tube emerges from a macroconidium through the surface of a honeydew drop and a secondary conidium of an oval to pearlike shape is formed, to which the contents of the original macroconidium migrates.
23.
Once a haploid fungus within N . crassa has attracted or has been attracted to a mate of a different mating type, it will develop either a protoperithecium or conidium to sexually fertilize or both structures to self-fertilize.
24.
Mummified berries, twig bark, and dead branches are considered to be primary inoculum sources for the disease . " Colletotrichum " conidium germination can occur 24 hours after conidia enter into contact with the tissues of the host plant.
25.
However, as a recipient, the protoperithecium of both the " A " and " a " strains can be thought of as the female structure, and the fertilizing conidium can be thought of as the male participant.
26.
The colour of mycelia ranges widely from light pink to orange, and sometimes yellow, white or green . " A . strictum " filaments are sometimes bound together into ropes several cells in diameter . Conidium grow as wet clusters or dry chains, and grains produced are white to pale-yellow, soft and variable in shape.
27.
The poroconidia are curved slightly to distinctly, transversely septate, with an expanded third cell from the pore end of the conidium . " Curvularia " can be easily distinguished from " Bipolaris " and " Drechslera " spp . since the conidia are non-distoseptate, that is, septate from edge to edge of the conidial wall.
28.
In 1982, Enrique Descals described an aquatic hyphomycete " Tricladiopsis flagelliformis " growing from submerged leaves found in the shoreline of Windermere ( Cumbria, England ), which he tentatively assigned as the specific epithet " flagelliformis " ( from the Latin " flagellum " " whip " and " formis " " shape " ) refers to the " whip-like " form of the conidium.
