Published in Fieldiana Botany, in 1970, in volume 32, issue 12, pages 179-206

Published in Fieldiana. Botany, in 1970, in volume 32, issue 14, pages 211-214

Published in Fieldiana Botany, in 1970, in volume 32, issue 15, pages 215-240

Published in Fieldiana Botany, in 1970, in volume 33, pages 1-80