1. ABBIATTI, D.: Darwiniana 13, 537–567 (1964).
2. ATKINSON, L.: Amer. Fern J. 55, 32–35 (1965)
3. ATKINSON, L., and A. STOCKEY: Phytomorphology 14, 51–70 (1964).
4. ATTINGER, E.: Ber. Schweiz. Bot. Ges. 75, 92–95 (1965).
5. BAJPAI, N.: J. Ind. Bot. Soc. 43, 549–555 (1964).