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Haustorium (pl. Haustoria) A modified mycelial branch that grows into a plant cell, makes intimate contact with the protoplast, and absorbs food. Also used for parasitic plants. ...

Heteroecious Requiring two or more unrelated hosts for completing the life cycle of a rust. ...

Heterothallic Producing fusing gametes on separate and distinct mycelia. ...

Homothalic Producing fusing gametes on the same mycelium. ...

Host The plant on or in which a parasite lives and from which it obtains its food. ...

Hyaline Clear, translucent. ...

Hydathode An epidermal leaf structure specialized for secretion or exudation of water; leaf opening at terminus of vein. ...

Hyperplasia The abnormal increase in the number of cells without their enlargement. ...

Hypertrophy The abnormal increase in the size of cells, causing abnormal development of an organ or tissue. ...

Hypha A single filament of a fungus mycelium. ...