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ANATOMY AND ALGAL‐FUNGAL INTERACTIONS IN THE LICHEN USNEA CAVERNOSA 1
Author(s) -
Malachowski James A.,
Baker Karen K.,
Hooper Gary R.
Publication year - 1980
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.1529-8817.1980.tb03044.x
Subject(s) - biology , hypha , extracellular , haustorium , lichen , botany , anatomy , microbiology and biotechnology , ecology , host (biology)
Interactions between fungal and algal components of Usnea cavernosa Tuck, were demonstrated with transmission and scanning electron microscopy. Cells were observed in very close associations, and both intrawall and intracellular haustoria were evident. In addition, a previously unreported type of interaction was discovered which consisted of an extracellular hyphal sheath with distinctive protuberances which penetrated into the algal cell wall. Internal environmental factors which may bear on the types of cellular interactions were evaluated by dividing the lichen thalius into three artificial regions using spatial and temporal criteria. Fungal hyphae in the various internal anatomical zones (e.g., cortex, medulla, central cord) demonstrated differences in cell wall structure and extracellular material produced.