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Diagram of the apparatus for measuring the pigeon's absolute visual threshold. (After D S. Blough, A method for obtaining psychophysical thresholds from the pigeon, J. Exp. Anal. Behav., 1:31–43, 1958)

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from article Hepaticopsida

Jungermanniidae, the leafy liverworts. (a) Herberta, showing three ranks of equal bifid leaves. (b) Lepidozia, ventral aspect, showing reduced ventral leaves. (c) Leucole jeunea, ventral aspect, showing reduced ventral leaves and complicate dorsal…

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from article Hepaticopsida

Diagram of life cycle of the liverwort Marchantia, indicating stages at which chromosome changes occur. (After H. J. Fuller, The Plant World, rev. ed., Holt, 1951)

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from article Hepaticopsida

Transverse sections through the thallus of Marchantia. (a) Middle portion with scales and rhizoids on the underside. (b) Margin of the thallus more highly magnified. (After H. Kraemer, Applied and Economic Botany, 2d ed., Wiley, 1916)

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from article Hepaticopsida

Marchantia. (a) Example of male gametophyte (antheridial plant) (after H. J. Fuller and O. Tippo, College Botany, Holt, 1949). (b) Section through an antheridial receptacle (after W. J. Robbins and H. W. Rickett, Botany, 3d ed., Van Nostrand, 1939).

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from article Hepaticopsida

Marchantia. (a) Example of female gametophyte (archegonial plant) (after H. J. Fuller and O. Tippo, College Botany, Holt, 1949). (b) Section through an archegonial receptacle (after W. J. Robbins and H. W. Rickett, Botany, 3d ed., Van Nostrand,…

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from article Hepaticopsida

Marchantia sporophyte morphology. (a) Mature archegonial receptacles of sporophytes (after W. J. Robbins and H. W. Rickett, Botany, 3d ed., Van Nostrand, 1939). (b) Marchantia polymorpha, longitudinal section showing the internal structure of a…

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from article Hepaticopsida

Structures involved in vegetative reproduction of Marchantia. (a) Portion of surface of the thallus. Note gemma cup with gemmae (after H. J. Fuller and O. Tippo, College Botany, Holt, 1949). (b) Notched, lens-shaped gemma of M. polymorpha (after G.…

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from article Ergot and ergotism