cystodium; it’s not a tree fern: it’s a polypod! jessica zamiara pbio 209
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1965
• Two Papers Published
• The Gametophyte of Cystodium & New Cytological Records for Cystodium & Dicksonia
• Uniting factor lack of hairs on the Thallus of Dicksonia & Cystodium Gametophyte
• Cystodium 2n=112, n=56
1966
• Anatomy of Cystodium, Sen & Mittra
• First detailed account• Stark contradicts
between Dicksonia & Cystodium
• Differences do not rule out origin from a common ancestor
1981
• Spore Morphology in the Dicksoniaceae, Gastony
• 32 typical number for spores per sporangia - not apogamous!
• Completely different from other cyatheoid-dicksonioid species
1986
• The Stipe & Rachis Vasculature of the Dicksonioid Fern, Cytodium Sorbifolium. Croft
• Sen & Mittra had stipe wrong
• Genera Cystodium & Dicksonia have little in common other than hairy stipe & indusium structure
• Proposed through anatomical, spore, chromosome evidence for Cystodiaceae
2006
• On the Phylogenetic position of Cystodium, Korall et al.
• DNA sequence data from rbcL and atpB
• Cystodium is resolved into the polypod clade with high support
• Tentatively inclusion in Lindsaeceae, certainly not a member of Dicksoniaceae
BibliographyLenette R. Atkinson , 1965, The Gametophyte of Cystodium. American Fern Journal, Vol. 55,
No. 1, pp. 32-35 J. R. Croft, 1986,The Stipe and Rachis Vasculature of the Dicksonioid Fern, Cystodium
sorbifolium (Cystodiaceae). Kew Bulletin, Vol. 41, No. 4, pp. 789-803 Gerald J. Gastony, 1981, Spore Morphology in the Dicksoniaceae. I. The Genera Cystodium,
Thyrospteris, and Culcita. American Journal of Botany, Vol. 68, No. 6, pp. 808-819 Petra Korall, David S. Conant, Harald Schneider, Kunihiko Ueda, Harufumi Nishida, Kathleen
M. Pryer, 2006, On the Phylogenetic Position of Cystodium: It's Not a Tree Fern: It's a Polypod! American Fern Journal, Vol. 96, No. 2, pp. 45-53
B. S. Parris, 1983, Proposal to Conserve Cystodium J. Smith (Pteridophyta: Dicksoniaceae)
against Cystodium Fée (Fungi: Incertae sedis). Taxon, Vol. 32, No. 4, pp. 648-649 S. K. Roy and R. E. Holttum, 1965, New Cytological Records for Cystodium and Dicksonia. American Fern Journal, Vol. 55, No. 1, pp. 35-37 U. Sen and D. Mittra, 1966, The Anatomy of Cystodium. American Fern Journal, Vol. 56, No.
3, pp. 97-101
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