走査電顕による地衣体菌糸組織の構造について

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In addition to the light microscope, the scanning-electron microscope was used to examine hyphal tissues of the following 7 lichen species : Candelaria concolor (Dicks.) Stein., Cetraria oakesiana Tuck., Cetrelia cetrarioides (Duby) Culb. & C. Culb., Leptogium menziesii Mont., Parmelia acetabulum (Neck.) Duby, Roccella fuciformis (L.) DC., and Umbilicaria vellea (L.) Ach. The following 6 types of hyphal tissues are recognized : paraplectenchyma, scleroplectenchyma, chalaroplectenchyma, prosoplectenchyma, pallisadoplectenchyma, and serioplectenchyma. Scleroplectenchyma can be divided into two subtypes : one is formerly known as paraplectenchyma. Some prosoplectenchyma with narrow lumina and strongly thickened walls, can be distinguished as sclero-prosoplectenchyma. For the practical object, 6 plectenchyma types with some subtypes are arranged as the following preliminary key to plectenchymas : Preliminary key to lichen hyphal tissues 1. The separate hyhae not distinguishable 2. Cells almost isidiametric, round to polyhedral with wide lumina, outer cell wall poorly developed to form membrane 3. Cells with wide lumina and non-thickened walls, polyhedral to mutual pressure … PARAPLECTENCHYMA 3. Cells with wide lumina and thickened walls, round… SCLEROPLEOTENCHYMA TYPE A 2. Cells rounding up, round to more or less elongated, with narrow lumina and strongly thickened walls ; with outer cell walls developed to form as if intercellular material 4. Hyphal tissue not steined … SCLEROPLECTENCHYMA TYPE B 4. Hyphal tissue brownish steined … PLATYSMOID 1. The separate hyphae distinguishable 5. Hyphae running in all directions, not parallel 6. Hyphae with their walls not united, Iumina wide with intercellular spaces … CHALAROPLECTENCHYMA 6. Hyphae with their walls united lumina small, without intercellular spaces … PROSOPLECTENCHYMA 5. Hyphae running in one-direction, parallel 7. Hyphae more or less clavate, with more or less intercellular spaces, not cohering, (hypha running rectangular to the thallus surface) … PALLISADOPLECTENCHYA 7. Hyphae not clavate, without intercellular spaces, more or less cohering 8. Hyphae with wide lumina and non-thcikened walls, not strongly cohering … SERIOPLECTENCHYMA 8. Hyphae with narrow lumina and strongly thickened walls, strongly cohering … SCLERO-PROSOPLECTENCHYMA