Glossary 211 



GLOSS AET. 



Abstriction. The formation of a spore by pinching off the end of a spore-forming 

 hypha, without the production of a septum. 



Aecidios-pore. A spore formed in an aecidium, serially and successively abstricted. 



Aecidium. A spore-body consisting of a cup-shaped envelope or peridium with a 

 hymenium at the bottom of the cup, from which aecidiospores are successively 

 detached; also the generic name originally applied to the aecidiospores. 



'Amphigenous. Growing on both surfaces of a leaf. 



Am^his-pore. A modified uredospore with thickened wall, and only germinating 

 after a resting period. 



A-p^pressorium. The vesicle formed by the tip of a germ-tube over the stoma of a 

 leaf before entering it. 



Autoecious. Applied to a parasitic fungus of which all the spore-forms are capable of 

 being produced on the same host. 



Basidium. The mother-cell or hypha from which spores are given off. 



Basi-petal. Growing in the direction of the base from above downwards. 



Bullate. Raised like a blister. 



Caeoma. A spore-layer in which the spores are formed in chains but without an 

 envelope of peridial cells; an aecidium without a peridium. 



Caeomos-pore. A spore formed in a caeoma. 



Ca-pitate. Ending in a head, as when the free end of an upright hypha enlarges in 

 a spherical manner. 



Chemotaxis. A form of sensitiveness which certain organisms possess towards cer- 

 tain chemical substances. 



Circinate. Arranged in a circular manner or nearly so. 



Clavate. Club-shaped, enlarging towards the apex. 



Deciduous. Falling away, applied to the pedicel of a spore when it does not re- 

 main attached to it. 



Echinulate. Covered with short spines. 



Elliptical. Shaped like an ellipse or oval. 



Endochrome. The peculiar colouring matter in the cells, and usually applied to the 

 coloured cell-contents of spores. 



Endos-pore. The innermost coat of a spore. 



E-pi-phyllous. Growing on the .upper surface of a leaf. 



E-pileos'pore. A name suggested for a uredospore which functions as an aecidiospore, 

 and the sorus contains or is surrounded by prominent paraphyses. 



Erum-pent. Bursting through the surface of the host-plant. 



Fimbriate. Fringed, when the margin is bordered by slender processes. 



Form-genus. A genus in which the species are only represented by single stages of 

 what is believed to be an incomplete life-history, as Uredo, Aecidium. 



Gall. A morbid enlargement or hypertrophy of the cells of a plant, due to para- 

 sitic agency. 



Gatnetofhyte.lhe stage in the life-cycle of the plant which bears the sexual organs. 



Germ-fore. An opening on tho surface of a spore through which the germ-tube 

 passes. 



Germ-tube. A tubular process developed from the spore in germination, and may 

 either become a mycelium or promycelium. 



Gibbous. Swollen at the base. 



Globose. Spherical. 



Haustorium.A short lateral branch of a hypha, penetrating a cell of the host-plant 

 and acting as a sucker as well as an organ of attachment. 



Heteroecious Applied to a parasitic fungus of which certain spore-forms occur on 

 one host and others on plants widely remote. 



Host. A plant which nourishes a parasite. 



Hyaline. Colourless or translucent. 



