A mixture of chloral hydrate, phenol, and mercuric chloride colors this substance blue-green or magenta in Alexander’s stain. Either the nuclear stain TTC or the dye fluorescein (“flor-ESS-ee-in”) diacetate are used in viability assays for this substance. In vitro culture of this substance uses a “hanging drop” technique in which individual drops of boron-rich media are loaded with it and placed into a cavity slide. Auramine and calcofluor stain this substance’s (*) exine and intine layers, respectively, which begin to form after four callose walls are degraded. (10[1])The enzyme callase and the protein RAFTIN are supplied by Ubisch bodies from the tapetum to strengthen this substance. The relative location of the stomium determines if this substance undergoes “extrorse” or “introrse” dehiscence (“dee-HISS-ence”) from the anther. For 10 points, (10[3])the pistil (10[1])receives (10[2])what (10[1])substance (10[2])that (10[2])contains (10[2])male gametes? ■END■ (10[1])