This paper describes in detail the thalli with cephallae, pseudocyphellae, and other allied structures in Lobariaceae (=Stioctaceae), which are now used as the generic character in this family. Since electron beams reflected from the surface of object produce images with a remarkable three-dimentional quality because of the great depth of focus, the scanning electroscope (SEM) is used in order to observe the fine structure of the objects. The following materials are used for examining the SEM structure : for cyphellae, Sticta gracilis (Mull. Arg.) Zahlbr., S. damaecornis Ach., S. weigelii (Isert. ex Ach.) Vain., and S. duplolimbata (Hue) Vain.; for psedocyphellae, Pseudocyphellaria crocate (L.) Vain. And P. argyracea (Del.) Vain.; for denuded areas of the thallus, Lobaria spathulata (Inum.) Yoshim. And L. scrobiculata (Scop.) DC. Cyphellae can be delimited as an opening on the lobe surface, of which the bottom is wholly corticated, and the margin (the rim) is of a similar nature to the other surface tissue, which is composed of well-developed hyphal tissue (mostly scleroplectencyma). However, it can be distinguished from the other thallus surface by its lack of tomenta. The cortex of the opening bottom is composed of round, semiglobose, hyphal chains, which are arranged vertically to its cortex surface. The degree of conglutination of the hyphae of the cortex varies according to the species. In the case of pseudocyphellae, the surface of the opening is not corticated, and long hyphae in the hole are vertically arranged to the surface; they are not conglutinated with each other. The pseudocyphella does not have a consicuous rim like a cyphella. The denuded areas of Lobaria spathulata looks like cyphellae; however, they lack a conspicuous rim, and are smoothly corticated throught, although the thickness of the cortical portion is slightly thinner than the remaining portion with tomenta. The cortical hyphae in denuded areas of the thallus are arranged parallel to the surface of the thallus and formed as prosoplectenchyma. The denuded areas of L. scrobiculata are similar to those of L. spathulata; however, hyphae of the denuded areae of L. scrobiculata are more separated and polysaccharides among the hyphae are less common than those of L. spathulata.
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