. Botanical gazette. Plants. 6 BOTANICAL GAZETTE [july The secondary gills originate at varying distances from the stem in the same manner as the primary gills, and their develop- ment progresses outward. Young secondary gills are shown in figs. 20, 22, 37, and 38. They are also well shown in a transection of the fruit body (figs. 24, 39). The primary gills during their origin and development are attached to the stem (figs. 9, 15, 30, 32), and in a transverse section of a fruit body (fig. 24), but they become free during the general expansion of the fruit body (fig. 23). In Agaricus rodmani At
. Botanical gazette. Plants. 6 BOTANICAL GAZETTE [july The secondary gills originate at varying distances from the stem in the same manner as the primary gills, and their develop- ment progresses outward. Young secondary gills are shown in figs. 20, 22, 37, and 38. They are also well shown in a transection of the fruit body (figs. 24, 39). The primary gills during their origin and development are attached to the stem (figs. 9, 15, 30, 32), and in a transverse section of a fruit body (fig. 24), but they become free during the general expansion of the fruit body (fig. 23). In Agaricus rodmani Atkinson (7) found that the gills were often attached to the stem in the early stages of development. ORIGIN OF CYSTIDIA During the-origin of the gill saHents the cystidia begin to appear (figs. 34-36). Text fig. 3 shows in outline the position of cystidia and basidia in the basidiocarp shown in fig. 36 as accurately as could be determined. As shown here, the filaments bearing both cystidia and young basidia pass out from the trama in a usually unbranched condition, the cystidia being only distinguishable from the basidia by their more scanty protoplasmic content and larger size. As the gills develop, however, the filaments leading out Fig. ^.^Course of filaments form- , ,1 ,â¢â ,â â , 1 1 , J , J- . to the cystidia become enlarged ing trama and leadmg out to young -' " basidia and cystidia. and for some time remain little, if at all, branched, while those bear- ing basidia and paraphyses are smaller and much branched (figs. 38, 47, 47a, text fig. 4). A and B of text fig. 4 show the details of the gills at this stage as definitely as could be determined, A being a reconstruction of the portion shown in fig. 47a. A slightly older gill is shown in fig. 48 and text fig. 5, A showing the detail of the cystidium shown in fig. 48, and 5, C, D, E, and F showing parts of other gills in the same series. The filaments bearing the cystidia seemingly branch somewhat during the late
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