Search results
Results from the WOW.Com Content Network
They have few septa and lack clamp connections. Fusiform skeletal hyphae are the second form of skeletal hyphae. Unlike typical skeletal hyphae these are swollen centrally and often exceedingly broad, hence giving the hypha a fusiform shape. Binding hyphae are thick-walled and frequent branched. Often they resemble deer antlers or defoliated ...
Nocardia colonies have a variable appearance, but most species appear to have aerial hyphae when viewed with a dissecting microscope, particularly when they have been grown on nutritionally limiting media. Nocardia grow slowly on nonselective culture media, and are strict aerobes with the ability to grow in a wide temperature range.
In some species, aerial hyphae consist of long, straight filaments, which bear 50 or more spores at more or less regular intervals, arranged in whorls (verticils). Each branch of a verticil produces, at its apex, an umbel, which carries from two to several chains of spherical to ellipsoidal, smooth or rugose spores. [16]
When light, particularly blue light, is involved in the regulation of fungal development, it directs the growth of fungal structures and activates metabolic pathways. For instance, the zygomycota use light as signal to promote vegetative reproduction and growth of aerial hyphae to facilitate spore dispersal.
The conidiophores of P. spinulosum can arise from submerged or aerial hyphae. [4] For conidiophores arising from aerial hyphae, the size of the stipes is shorter, e.g., 25–30 μm in length. [5] The apex of conidiophores is inflated with simple (or monoverticilate) branching pattern. [5]
Some actinomycetes can form rod- or coccoid-shaped forms, while others can form spores on aerial hyphae. Actinomycetales bacteria can be infected by bacteriophages, which are called actinophages. Actinomycetales can range from harmless bacteria to pathogens with resistance to antibiotics.
Conidia are borne on a stalk called a conidiophore that can emerge either from a piece of aerial hyphae or from a soil-embedded network of hyphae. [1] [13] The conidiophore is usually an asymmetrical, delicate structure with smooth, thin walls. [1] [2] Sizes can range from 70–150 μm in length. [1]
The fungus radiates when young and becomes columnar shaped with a diameter of 80 to 90 μm. Conidial heads arising from aerial mycelium are smaller and become columnar quicker. [8] Conidiophores arise from surface or aerial hyphae with the stipe's length ranging from 150 to 300 μm. The walls are thin, smooth and colorless.