. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 226 REPRODUCTION, VEGETABLE (VEGETABLE OVUM). sistence and of a dark-brown colour ; the other white and opaque. The former, which cor- Fig. 145. f'-ryjf: >'vTo f=4 ^V^s -«. -> - - S .^ ci>3 .,,-v',^-- :jrJ'O • ~'^^^^ t. Section of part of the receptacle of a Truffle, about 250 cliam. a, outer layer of the peridium consisting of a resistant tissue of thick-walled cells; b, inner layer of the same, formed of filamentous tissue continu- ous with that of v, one of the venae internse, or par- titions by which the com
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 226 REPRODUCTION, VEGETABLE (VEGETABLE OVUM). sistence and of a dark-brown colour ; the other white and opaque. The former, which cor- Fig. 145. f'-ryjf: >'vTo f=4 ^V^s -«. -> - - S .^ ci>3 .,,-v',^-- :jrJ'O • ~'^^^^ t. Section of part of the receptacle of a Truffle, about 250 cliam. a, outer layer of the peridium consisting of a resistant tissue of thick-walled cells; b, inner layer of the same, formed of filamentous tissue continu- ous with that of v, one of the venae internse, or par- titions by which the compartments (originally cavities) of the truffle are bounded. Portions of two of these compartments are seen with the thecre and septate filaments which they contain. responds to the partitions which, in the young state of the truffle, separated the cavities, is continuous with the external tissue which composes the envelope or peridium, and con- stitutes the vena internae of Vittadini.* The laminae which it forms, consist of filaments running, for the most part, parallel to each other. The white substance which occupies the original cavities of the tuber, is formed of closed tubes, which are given oft" in great numbers from the surfaces of the laminae. These tubes, which are the terminations of the filaments of which the laminae are com- posed, are of two kinds. Some are of equal diameter throughout, and divided at intervals by septa; others, much shorter, are dilated at their extremities, and contain spores (thecas). Each theca is an obovate vesicle, and con- tains two, three, or more spores, never more than eight. Each spore is invested with a beau- tifully reticulate, or sometimes warty epispore, within which may be distinguished a smooth inner membrane, immediately enclosing the oleaginous }- •" Vittadini, Monog. Tuberacearum, p. 2. et seq. t L. R. & C. Tulasne, Histoiredes Champignons hypo gees, 41-50. 37. Theascophorous Fungi are represented i
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