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Sporangia (clustered in sori) on a fern leaf Equisetum arvense strobilus cut open to reveal sporangia. Sporangia can be terminal (on the tips) or lateral (placed along the side) of stems or associated with leaves. In ferns, sporangia are typically found on the abaxial surface (underside) of the leaf and are densely aggregated into clusters ...
Thick-walled resting spores of fungi produced to survive in unfavorable conditions Asomycota: Pseudohyphae, chlamydospores and blastospores of Candida yeast. Parasitic Fungal Spore Internal Spores Germinate within a host A parasitic pink fungi on a Lichen tree: External (Environmental) spores Spores released by the host to infest other hosts [7]
A walled spore produced within a sporangium. [358] sporangium. pl. sporangia. A sac-like structure that produces spores endogenously. From Gr. angeion, vessel. [359] spore A reproductive structure in fungi. Can result from both sexual and asexual processes. [360] spore wall The layered wall defining a spore. Considered to have five layers.
The fungus produces a thick walled structure known as a winter sporangium. It is 25-75 μm in diameter and contains 200-300 spores. Sporangia are clustered into thin-walled sori. The motile life stage, zoospore is about 0,5 μm in diameter and has one posterior flagellum.
The sporangiospores are asexual mitospores (formed via mitosis), produced inside sporangia (thousands of spores) or sporangioles (single or few spores).They are released when mature by the disintegration of the sporangium wall, or as a whole sporangiole that separates from the sporangiophore.
The germinated zygote produces a diploid thallus with two types of sporangia: thin-walled zoosporangia and thick walled resting spores (or sporangia). The thin walled sporangia release diploid zoospores. The resting spore serves as a means of enduring unfavorable conditions. When conditions are favorable again, meiosis occurs and haploid ...
Spores develop on sides and edges of wall; Spores: The spores are round or oval globules individually attached to stalks sprouting from sporangia. Spores vary in size (8-13 μm in diameter). The spore walls are thin and transparent. Spores appear grainy and may have some vacuoles which are often near the perimeter or surrounding the nucleus.
Sexual reproduction of an oospore is the result of contact between hyphae of male antheridia and female oogonia; these spores can overwinter and are known as resting spores. [4]: 409 Asexual reproduction involves the formation of chlamydospores and sporangia, producing motile zoospores. [4]