. Botanical gazette. Plants. 1919] WALKERâPLUTEUS AA'D TUBARIA 9 CHANGES TAKING PLACE IN TRAMA DURING DEVELOPMENT As can be seen in ligs. â¢36-38, 47, 48, and text ligs. 3 and 4, the trama of the young gills is composed of slender, somewhat parallel filaments which are scarcely 2 )u in diameter at first, but soon become 2-2. 5 m in diameter, as seen in fig. 38. The trama of the gills is also very narrow and made up of relatively few filaments. As expansion of the fruit body takes place rapid changes occur in the trama. Fig. 25 is a transection of the gills of the plant shown in median section
. Botanical gazette. Plants. 1919] WALKERâPLUTEUS AA'D TUBARIA 9 CHANGES TAKING PLACE IN TRAMA DURING DEVELOPMENT As can be seen in ligs. â¢36-38, 47, 48, and text ligs. 3 and 4, the trama of the young gills is composed of slender, somewhat parallel filaments which are scarcely 2 )u in diameter at first, but soon become 2-2. 5 m in diameter, as seen in fig. 38. The trama of the gills is also very narrow and made up of relatively few filaments. As expansion of the fruit body takes place rapid changes occur in the trama. Fig. 25 is a transection of the gills of the plant shown in median section in fig. 23, where expansion is just well begun. A higher magnification of a part of these gills is shown in fig. 42. Here one observes a great multiplication of the filaments making up the trama, along with an enlargement of the individual cells. The multiplication of cells takes place largely in the region just below the hymenium, and is in the form of outgrowths of the sub- hymenial cells. These outgrowths extend downward and toward the center of the trama, as can be seen opposite A on the left of fig. 42, and in text fig. 7, which shows in a slightly diagrammatic manner the detail of this part of the section. These outgrowths continue their growth, maintaining a Fig. of gill seen opposite downward and inward direction, A in fig. 42, showing beginnings of down- as is seen in a slightly older fruit ^^'^â "^ outgrowths from subhymenium , , , - ^ V . , . , which develop during expansion of basid- body (figs. 26, 43), m which j^^^^p many of these filarhents have reached the center of the trama. In these cells the protoplasm is much more dense in the apical end, and in many cases largely con- fined to this part. Figs. 27 and 44 show a still more extensive development of these filaments which have now become 4-5 fx in diameter, while figs. 28 and 45 show the gills when basidia have reached a 4-nucleate stage, but before spore formation, with the tramal cells abo
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