Published in Journal of South African botany, in 1947, in volume 13, pages 65-71

Published in Journal of South African botany, in 1947, in volume 13, pages 73-93

Published in Journal of South African botany, in 1947, in volume 13, pages 95-97

Published in Journal of South African botany, in 1947, in volume 13, pages 99-105

Published in Journal of South African botany, in 1947, in volume 13, pages 107-116

Published in Journal of South African botany, in 1947, in volume 13, pages 117-120

Published in Journal of South African botany, in 1947, in volume 13, pages 121-203