sporangium (pl. sporangia)
A tiny globe in which the spores are produced; often applied to the capsule, but by some authors restricted to the spore sac, or inner sac of the capsule containing the spores.
GardenWeb Glossary of Botanical Terms ...
The Sporangia
The sporangium in most ferns is a thin-walled case, usually on a stalk, that has a ring of thick-walled cells known as the annulus, which aids in opening the sporangium when the spores are fully mature.
When the soil is moist or wet, reproductive structures (sporangia) are produced, either as the result of germinating resting spores or as direct outgrowths of the active fungus within infected roots and crowns.
The ferns reproduce by producing spores, these are housed in brown coloured sporangia on the backs of the fronds.
sporangiophore -- A stalk to which sporangia are attached.
sporangium -- A chamber inside of which spores are produced through meiosis.
sporophyll -- Any leaf which bears sporangia is called a sporophyll.
sporangium (plural: sporangia). A structure in which asexual spores are produced.
spore. A reproductive body produced by certain fungi and other organisms, capable of growing into a new individual under proper conditions.
Sporocarp A body containing sporangia or spores.
Sporophyll A spore bearing leaf.
Sport A shoot that differs from a plant and can be reproduced as such.
Sporophyll- A modified leaf or leaflike structure which bears sporangia, e.g., the stamens and carpels of the angiosperms.
These brown spots are sori, the collection of spore-bearing sacs (called sporangia). Since ferns don't flower, they don't produce seed. Instead, they scatter spores to start the reproductive process.
They are only dependant on the gametophyte in very early stages, and the adult sporophyte have roots, stem, leaves, a vascular system, and several kinds of sporangia. We all cultivate ferns for their sporophytes.
Inner bark of affected rootstock
Inner bark of affected roots with knife at soil line
Sporangia of P. cambivora
Inner bark of affected rootstock
Disease cycle
Table of apple rootstock susceptibility to Phytophthora spp.
 See also: Spore, Plant, Produce, Genera, Sporangium
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