Read about Phycomycetes in the Standard Cyclopedia of Horticulture
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PHYCOMYCETES. A large group of parasitic or saprophytic organisms (fungi), without chlorophyll: thallus (mycelium) of much-branched filaments (hyphae); usually without cross-walls (non-septate), as in the algal group Siphoneae: asexual reproduction by motile or non-motile spores which are usually borne in sporangia, and by conidia which are cells abstricted from the tips of specialized hyphae: sexual reproduction diverse, either by the conjugation of similar gametes, or by the conjugation of a specialized antheridial branch (male) and an enlarged oogonial branch (female) which contains the egg; free sperm-cells are rare. The order Oomycetes, with differentiated gametes, contains the following important fungi: Saprolegnia (water-mold), a whitish, aquatic mold growing on decaying plants, insects, or living fishes; Olpidium brassicae, parasitic in cells at the base of the stem of young cabbage plants causing their death; Phytophthora infestans (potato disease); Plasmopara viticola, downy or false mildew of the grape; Albugo candida, white rust of Cruciferae; Pythium de Baryanum, causing damping off of seedlings. Order Zygomycetes, with similar gametes, contains Mucor mucedo, white mold of bread, fruits, etc.; Rhizopus nigricans, a mold on bread, fruit, etc.; Empusa muscae, parasitic on houseflies, causing their death and producing a white halo about them on the surface where they die.
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References
- Standard Cyclopedia of Horticulture, L. H. Bailey, MacMillan Co., 1963
External links
- w:Phycomycetes. Some of the material on this page may be from Wikipedia, under the Creative Commons license.
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