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Science 2 June 1978:
Vol. 200. no. 4345, pp. 1062 - 1064
DOI: 10.1126/science.200.4345.1062
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Articles

Scanning Electron Microscope Study of Early Lichen Synthesis

VERNON AHMADJIAN 1, JEROME B. JACOBS 2, and LORRAINE A. RUSSELL 3

1 Department of Biology, Clark University, Worcester, Massachusetts 01610
2 St. Vincent Hospital and University of Massachusetts Medical School, Worcester 01604
3 Department of Biology, Clark University

In the early stages of cellular interaction between the symbionts of Lecidea albocaerulescens, the phycobiont produced an extracellular sheath which bound to it hyphae of the mycobiont. Such a sheath may be a means by which the symbionts recognize each other. Hyphae of the mycobiont formed flattened appressoria as they grew over the algal cells and in this way secured the autotrophic population necessary for the development of a lichen thallus.

Submitted on November 23, 1977
Revised on February 28, 1978

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Science. ISSN 0036-8075 (print), 1095-9203 (online)