Abstract
The midstage spermatid ofMonoclea gottschei subsp. elongata displays typicalfeatures of the subclass Marchantiidae. The multilayered structure (MLS) is four-layered (S,-S4). The spline (Sj is comprised of 26 microtubules at its maximum width and has a closed aperture with a predominant width of 3 microtubule diameter equivalents. The outline of the spline is spatulate, resultingfrom the presence of shorter microtubules on the left margin. The underlying lamellar strip (LS, S2-S4) is longitudinally elongate and ovate, 1.8 jtm in length and 0.8 1tm in width, with a right lateral offset or notch. The basal bodies are staggered in insertion and overlapping. The anterior basal body (ABB), at 0.7 ,im, diverges outward from the longitudinal axis of the spline while the posterior basal body (PBB), at 0.8 ,im, is essentially parallel with the spline microtubules. These data indicate a relationship of the monotypic order Monocleales, with the subclass Marchantiidae and also with the genus Blasia. The compact blepharoplast, overlapping basal bodies of similar lengths, LS with right lateral notch and the three-microtubule aperture are shared features that characterize this alliance of liverworts.
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