By BERNARD GOFFINET, A.JONATHAN SHAW
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Consequently the sporophyte appears to be embedded in thallus tissue. In the Sphaerocarpales the sporophyte and calyptra develop within bottle-shaped pseudoperianths, and in the Ricciaceae and Monocarpus only calyptrae are formed (Bischler 1998). Usually the calyptrae are hyaline and 2- or 3-layered, but in Corsinia they can be fleshy, green and tuberculate. g. Asterella, 27 28 B. Crandall-Stotler and others Neohodgsonia and Marchantiaceae, each sporophyte is surrounded by a calyptra and pseudoperianth, inside the involucre, which in some Marchantiaceae may include several sporophytes.
Analyses of character evolution have demonstrated that there is substantial homoplasy in many of the characters previously used to define genera, families and even suborders (Crandall-Stotler et al. 2005). That does not mean, however, that morphology cannot provide phylogenetically informative characters. g. the relationships between Haplomitrium and Treubia, Blasia and the Marchantiopsida, and Pleurozia and the Metzgeriales (for discussion see Crandall-Stotler et al. 2005, Forrest et al. 2006, Renzaglia et al.
In all other liverworts, a one- to few-celled suspensor-like structure, called the haustorium, subtends the foot (Fig. 8B). This structure mediates nutrient transfer from the gametophyte to the embryonic sporophyte and orients the embryo in the venter; in mature sporophytes it may be obscured by the enlarged cells of the foot. Foot shape is variable, but is often conoidal, sometimes with a unistratose haustorial collar, or involucellum, originating at its juncture with the seta. g. Schistochila and Jackiella, the involucellum consists of elongate filaments that more or less ensheath the seta (Schuster 1966, p.
BryophyteBiology by BERNARD GOFFINET, A.JONATHAN SHAW