Round 6: Tossup 13

These structures are classified as alete if their surfaces lack laesura or ridge lines. Buildup of Buller’s drops accompanies the release of these structures in a “surface tension catapult” mechanism. These structures are concentrated in strobili by Equisetum. Blastic and thallic processes produce a non-motile type of these (10[1])structures called conidia. Columella support “vessels” enclosing these structures, which are singular and unbranched in bryophytes. (-5[1])A haploid gametophyte phase contrasts with a diploid (10[1])phase that produces (-5[1])these (10[1])structures (10[1])in alternation of generations. Puffballs have fruiting bodies that burst (10[2])to release (10[2])these structures, (-5[1])which are formed in gills (10[1])beneath the cap. For 10 points, name these reproductive structures that, unlike seeds, are dispersed as unicellular units. (10[1])■END■ (10[2])

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