Griffiths, HB/ Greenwood, AD/ Millbank, JW 1972: The frequency of heterocysts in the Nostoc phycobiont of the lichen Peltigera canina Willd.. - New Phytol.71: 11-13. [RLL List # 82 / Rec.# 7051] Keywords: HETEROCYSTS/ NOSTOC/ PELTIGERA/ NITROGEN FIXATION
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