01456nas a2200193 4500008004100000245008100041210006900122520087800191653001701069653001801086653001401104653001801118653001301136653001701149653001301166653001401179100002101193856004801214 2017 eng d00aA contribution to the pollen morphology of the Cryptocarya group (Lauraceae)0 acontribution to the pollen morphology of the Cryptocarya group L3 a

In this study, pollen grains of 74 taxa (84 specimens) of the Cryptocarya group, including 22 type collections, have been examined by scanning electron microscopy. Pollen grains of Aspidostemon, Endiandra, Hexapora, Potameia and Triadodaphne are described here for the first time. For the other genera (Beilschmiedia, Cryptocarya, Eusideroxylon, Potoxylon) the results of previous studies are largely confirmed, but a novel type of exine covered by clavate-baculate structures was found in a few Cryptocarya species (C. gracilis and C. macrodesme from New Caledonia, C. saligna from South America). A larger diversity of spinule morphology and density than hitherto known is documented among the African species of Beilschmiedia.

10aAspidostemon10aBeilschmiedia10aEndiandra10aEusideroxylon10aHexapora10ainaperturate10aPotameia10aPotoxylon1 aRohwer, Jens, G. uhttps://lauraceae.myspecies.info/node/2036002285nas a2200217 4500008004100000022001400041245014100055210006900196260001200265300001200277490000800289520157600297653001701873653001401890653002201904100002101926700002701947700002101974700002401995856004802019 2014 eng d a1179-316300aA phylogenetic analysis of the Cryptocarya group (Lauraceae), and relationships of Dahlgrenodendron, Sinopora, Triadodaphne, and Yasunia0 aphylogenetic analysis of the Cryptocarya group Lauraceae and rel c02/2014 a111-1320 v1583 a

A phylogenetic analysis based on nuclear ITS and plastid trnK intron sequences confirms that Dahlgrenodendron, Sinopora, Triadodaphne, and Yasunia are members of the Cryptocarya group, as expected from morphology.  Dahlgrenodendron from South Africa is sister to Aspidostemon from Madagascar. Triadodaphne inaequitepala is nested within Endiandra (both from Australasia), and Yasunia from South America is nested among South American Beilschmiedia species. Sinopora is a member of the Beilschmiedia clade, but its precise position is still uncertain.  Among large genera of the group, Cryptocarya is clearly monophyletic, and Endiandra appears to be as well, if T. inaequitepala is included. Beilschmiedia is paraphyletic with respect to (at least) Potameia and Yasunia. Most well-supported clades within genera are geographically homogeneous, except a clade including the Chilean Cryptocarya alba and two New Caledonian species. Both Beilschmiedia and Cryptocarya have reached the Americas more than once.  Four-locular anthers are plesiomorphic in the Cryptocarya group; two-locular anthers have arisen by fusion of the two pollen sacs of a theca. In the plesiomorphic fruit type, the ovary is completely enclosed in receptacular tissue; a superior fruit, seated free on its pedicel, is a synapomorphy of the Beilschmiedia clade.

10aBiogeography10aevolution10afloral morphology1 aRohwer, Jens, G.1 aMoraes, Pedro, L.R. de1 aRudolph, Barbara1 avan der Werff, Henk uhttps://lauraceae.myspecies.info/node/19803