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Systematic leaf anatomy of Caladeniinae (Orchidaceae)

1994; Oxford University Press; Volume: 114; Issue: 1 Linguagem: Inglês

10.1006/bojl.1994.1003

1095-8339

Alec M. Pridgeon,

Plant and Fungal Species Descriptions

Leaf anatomy of 25 species in 15 genera of Caladeniinae (Diurideae, Orchidaceae), excluding Caladenia, was investigated to determine diagnostic characters to be used in forthcoming, broad-based cladistic analyses of the subtribe and to assess interspecific and intergeneric relationshipS. Of the characters examined, those that show the most variation among the study taxa are presence and types of trichomes, cuticular sculpturing, anticlinal walls of epidermal cells, heterogeneity of chlorenchyma, distribution and length: width ratios of stomata. Anatomical evidence supports the generic concept of Leptoceras Lindley but contradicts that of Drakonorchis Hopper & A.P. Brown. Paracaleana is not sufficiently distinct from Caleana to warrant generic status. Lyperanthus serratus and L.suaveolens are hyperstomatic, a rare condition in Orchidaceae. On the basis of these and other characters, Lyperanthus, as currently circumscribed, is polyphyletic. From leaf structure Caladeniinae as now conceived is polyphyletic and comprises seven groups: (1) Caladenia, Leptoceras, Elythranthera, Eriochilus, Glossodia, Aporostylis; (2) Adenochilus, Rimacola; (3) Arthrochilus, Chiloglottis, Spiculaea, Leporella; (4) Caleana (including Paracaleana); (5) Bumettia; (6) Lyperanthus suaveolens and L.serratus; (7) Lyperanthus nigricans.