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Bryophyte Leaf Epiflora: An SEM and TEM Study of Polytrichum commune Hedw.

Daniel C. Scheirer and Heidi A. Dolan
American Journal of Botany
Vol. 70, No. 5 (May - Jun., 1983), pp. 712-718
Stable URL: http://www.jstor.org/stable/2443125
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Bryophyte Leaf Epiflora: An SEM and TEM Study of Polytrichum commune Hedw.
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Abstract

Epiphytes on leaves of Polytrichum commune Hedw. were observed and studied with SEM and TEM. A unicellular green alga, a fungus, and a rod-shaped bacterium were present on both leaf surfaces. Culturing experiments led to the identification of the alga as Chlorococcum sp. and the fungus as Trichoderma viride Lk. ex Fr. (Deuteromycetes). No attempt was made to culture and identify the bacterium. Terminal cells of the leaf lamellae form a ventral pseudoepidermis which provides a microhabitat for the epiphytes. Fungal hyphae were seen intracellularly as well as penetrating cell walls between lamellar cells. The alga and bacterium were not observed intracellularly. Chlorococcum sp. displayed a distinctive wall morphology which consisted of short (0.3-0.5 μm), blunt papillae. The rod-shaped bacterium may be similar to the Agrobacterium-like isolates reported recently from Polytrichum commune. Host-epiphyte associations relative to potential beneficial and/or pathological aspects of growth require further investigation.

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