wood anatomy cambium scelereids stem anatomy leaf antomy nodal anatomy stomata trichomes pollen polarity npc system aperture exine sculpture development of pollen wall intine exine anther dehiscence pollen wall erichoid orchid arbutoid monotropoid endomycorrhiza ectomycorrhiza mycorrhiza secretory tapetum amoeboid tapetum orbiscules tapetum middle layers endodermis epidermis anther wall
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