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Term Definition

Pertaining to sporangia that become dislodged readily and separate from the sporangiophore (in contrast to being persistent).


A plant disease characterized (in woody plants) by the death of cambium tissue and loss and/or malformation of bark, or (in non-woody plants) by the formation of sharply delineated, dry, necrotic, localized lesions on the stem; "canker" may also be used to refer to the lesion itself, particularly in woody plants


An asexual spore, usually globose but occasionally ovoid, that is delimited from the mycelium by a septum; may be terminal or intercalary with a thickened inner wall; survives for long periods in soil.


A taxonomic group of organisms classified together on the basis of homologous features traced to a common ancestor.

clonal lineage

A population of clonally reproducing individuals that descended from the same ancestor.

close sympodium

A simple sympodium in which the sporangiophores are very short. A clustered sympodium has short sporangiophores as well as short nodes between them.


The portion of the seedling or plant near the surface of the soil; in grafted woody plants, the scion portion of the plant near the soil surface.

compound sympodium

A sympodium with a branched hyphal system from which the sporangiophores initiate, can be irregular or regular. Cf. simple sympodium.


The junction of root and stem of a plant, usually at the soil line; in grafted woody plants, the rootstock portion of the plant near the soil surface.


An encysted zoospore, a short-lived resting structure enclosed within a cell wall.