The 1-5 blades (= flabella) of Avrainvillea longicaulis are broadly oval (to 10 cm high, 14 cm wide) with truncated lower margins [ILLUSTRATION FOR FIGURE 2A OMITTED] and are thick ([greater than]4 mm) and spongy (lacking a mucilaginous coating) with cylindrical or flattened stipes (= stalks, to 12 cm long, 13 mm diameter).
control) thalli of Avrainvillea longicaulis by artificially attaching natural epiphyte populations as well as by placing fine-mesh nylon cloth over the flabella and measuring the times and abundances of new proliferations.
Concomitantly, 20 proliferating incipient blades increased at a rate of several centimeters per day at their margins to produce new flabella averaging 47.1 [+ or -] 10.0 [cm.sup.2] in area within 72 h.
In both cases, dye passes the flabella. The flabella are therefore situated in the respiratory current where they can monitor chemical stimuli drawn in from a distance.
Although the specific sensory functions of the flabella remain unclear, the two currents we describe target two different (chemo)receptor organs, the gnathobases and the flabella.