Clade-age-dependent diversification under high species turnover shapes species richness disparities among tropical rainforest lineages of Bulbophyllum (Orchidaceae).

Phylogenetic generalised least squares regression The phylogenetic generalised least squares (PGLS) analyses on the Bulbophyllum backbone phylogeny revealed a generally strong, either marginally significant ( R 2 = 0.883, P = 0.060) or highly significant ( R 2 = 0.993, P = 0.004) relationship of, respectively, the stem and crown ages of the four lineages with their extant species numbers.

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