A new species, Rigodium adpressum (Musci: Rigodiaceae), is described and illustrated from the And... more A new species, Rigodium adpressum (Musci: Rigodiaceae), is described and illustrated from the Andean Cordillera of Chile and Argentina where it grows in mountainous areas most commonly forested by southern beech (Nothofagus spp.). The new species has an arborescent habit similar to that of R. toxarion and R. brachypodium, but differs from them in several features of the stem and stipe leaves-most notably in their appressed position and the well-differentiated basal decurrencies and intramarginal band of cells. A chart comparing the distinctive characters of these three taxa is provided. Rigodium is a tropical/austral temperate genus of pleurocarpous mosses first circumscribed by Schwigrichen (1845; Zomlefer 1990). The spe- cies occur primarily in Central and South Amer- ica and also in Hispaniola, Madagascar, and southeastern Africa. The genus is well-defined and recognizable by its dendroid to frondose habit with wiry axes and often a well-differ- entiated stipe (unbranched lower stem). The leaves are usually trimorphic (stipe, stem and branch; fig. 2C-E). Leaf cells, incrassate throughout, are generally rounded-quadrate to oblong (alar regions and margins) to rhombic- rhomboidal (upper and midlaminar areas). An intramarginal band of cells ? larger and thick- er-walled than those of the midlaminar areas is commonly present. The alar cells are not dif- ferentiated. The plants are dioicous, and the peristome is hypnoid (fig. 3R).
<b>Abstract</b><br/>We present the first phylogenomic analysis of relationships... more <b>Abstract</b><br/>We present the first phylogenomic analysis of relationships among all ten families of Liliales, based on 75 plastid genes from 35 species in 29 genera, and 97 additional plastomes stratified across angiosperm lineages. We used a supermatrix approach to extend our analysis to 58 of 64 genera of Liliales, and calibrated the resulting phylogeny against 17 fossil dates to produce a new timeline for monocot evolution. Liliales diverged from other monocots 124 Mya and began splitting into separate families 113 Mya. Our data support an Australian origin for Liliales, with close relationships between three pairs of lineages (Corsiaceae/Campynemataceae, Philesiaceae/Ripogonaceae, tribes Alstroemerieae/Luzuriageae) in South America and Australia or New Zealand reflecting teleconnections of these areas via Antarctica. Long-distance dispersal (LDD) across the Pacific and Tasman Sea led to re-invasion of New Zealand by two lineages (Luzuriaga, Ripogonum); LDD allowed Campynemanthe to colonize New Caledonia after its submergence until 37 Mya. LDD permitted Colchicaceae to invade East Asia and Africa from Australia, and re-invade Africa from Australia. Periodic desert greening permitted Gloriosa and Iphigenia to colonize Southeast Asia overland from Africa, and Androcymbium–Colchicum to invade the Mediterranean from South Africa. Melanthiaceae and Liliaceae crossed the Bering land-bridge several times from the Miocene to the Pleistocene.
We present the first phylogenomic analysis of relationships among all ten families of Liliales, b... more We present the first phylogenomic analysis of relationships among all ten families of Liliales, based on 75 plastid genes from 35 species in 29 genera, and 97 additional plastomes stratified across angiosperm lineages. We used a supermatrix approach to extend our analysis to 58 of 64 genera of Liliales, and calibrated the resulting phylogeny against 17 fossil dates to produce a new timeline for monocot evolution. Liliales diverged from other monocots 124 Mya and began splitting into separate families 113 Mya. Our data support an Australian origin for Liliales, with close relationships between three pairs of lineages (Corsiaceae/Campynemataceae, Philesiaceae/Ripogonaceae, tribes Alstroemerieae/Luzuriageae) in South America and Australia or New Zealand reflecting teleconnections of these areas via Antarctica. Long-distance dispersal (LDD) across the Pacific and Tasman Sea led to re-invasion of New Zealand by two lineages (Luzuriaga, Ripogonum); LDD allowed Campynemanthe to colonize New Caledonia after its submergence until 37 Mya. LDD permitted Colchicaceae to invade East Asia and Africa from Australia, and re-invade Africa from Australia. Periodic desert greening permitted Gloriosa and Iphigenia to colonize Southeast Asia overland from Africa, and Androcymbium–Colchicum to invade the Mediterranean from South Africa. Melanthiaceae and Liliaceae crossed the Bering land-bridge several times from the Miocene to the Pleistocene
A new species, Rigodium adpressum (Musci: Rigodiaceae), is described and illustrated from the And... more A new species, Rigodium adpressum (Musci: Rigodiaceae), is described and illustrated from the Andean Cordillera of Chile and Argentina where it grows in mountainous areas most commonly forested by southern beech (Nothofagus spp.). The new species has an arborescent habit similar to that of R. toxarion and R. brachypodium, but differs from them in several features of the stem and stipe leaves-most notably in their appressed position and the well-differentiated basal decurrencies and intramarginal band of cells. A chart comparing the distinctive characters of these three taxa is provided. Rigodium is a tropical/austral temperate genus of pleurocarpous mosses first circumscribed by Schwigrichen (1845; Zomlefer 1990). The spe- cies occur primarily in Central and South Amer- ica and also in Hispaniola, Madagascar, and southeastern Africa. The genus is well-defined and recognizable by its dendroid to frondose habit with wiry axes and often a well-differ- entiated stipe (unbranched lower stem). The leaves are usually trimorphic (stipe, stem and branch; fig. 2C-E). Leaf cells, incrassate throughout, are generally rounded-quadrate to oblong (alar regions and margins) to rhombic- rhomboidal (upper and midlaminar areas). An intramarginal band of cells ? larger and thick- er-walled than those of the midlaminar areas is commonly present. The alar cells are not dif- ferentiated. The plants are dioicous, and the peristome is hypnoid (fig. 3R).
<b>Abstract</b><br/>We present the first phylogenomic analysis of relationships... more <b>Abstract</b><br/>We present the first phylogenomic analysis of relationships among all ten families of Liliales, based on 75 plastid genes from 35 species in 29 genera, and 97 additional plastomes stratified across angiosperm lineages. We used a supermatrix approach to extend our analysis to 58 of 64 genera of Liliales, and calibrated the resulting phylogeny against 17 fossil dates to produce a new timeline for monocot evolution. Liliales diverged from other monocots 124 Mya and began splitting into separate families 113 Mya. Our data support an Australian origin for Liliales, with close relationships between three pairs of lineages (Corsiaceae/Campynemataceae, Philesiaceae/Ripogonaceae, tribes Alstroemerieae/Luzuriageae) in South America and Australia or New Zealand reflecting teleconnections of these areas via Antarctica. Long-distance dispersal (LDD) across the Pacific and Tasman Sea led to re-invasion of New Zealand by two lineages (Luzuriaga, Ripogonum); LDD allowed Campynemanthe to colonize New Caledonia after its submergence until 37 Mya. LDD permitted Colchicaceae to invade East Asia and Africa from Australia, and re-invade Africa from Australia. Periodic desert greening permitted Gloriosa and Iphigenia to colonize Southeast Asia overland from Africa, and Androcymbium–Colchicum to invade the Mediterranean from South Africa. Melanthiaceae and Liliaceae crossed the Bering land-bridge several times from the Miocene to the Pleistocene.
We present the first phylogenomic analysis of relationships among all ten families of Liliales, b... more We present the first phylogenomic analysis of relationships among all ten families of Liliales, based on 75 plastid genes from 35 species in 29 genera, and 97 additional plastomes stratified across angiosperm lineages. We used a supermatrix approach to extend our analysis to 58 of 64 genera of Liliales, and calibrated the resulting phylogeny against 17 fossil dates to produce a new timeline for monocot evolution. Liliales diverged from other monocots 124 Mya and began splitting into separate families 113 Mya. Our data support an Australian origin for Liliales, with close relationships between three pairs of lineages (Corsiaceae/Campynemataceae, Philesiaceae/Ripogonaceae, tribes Alstroemerieae/Luzuriageae) in South America and Australia or New Zealand reflecting teleconnections of these areas via Antarctica. Long-distance dispersal (LDD) across the Pacific and Tasman Sea led to re-invasion of New Zealand by two lineages (Luzuriaga, Ripogonum); LDD allowed Campynemanthe to colonize New Caledonia after its submergence until 37 Mya. LDD permitted Colchicaceae to invade East Asia and Africa from Australia, and re-invade Africa from Australia. Periodic desert greening permitted Gloriosa and Iphigenia to colonize Southeast Asia overland from Africa, and Androcymbium–Colchicum to invade the Mediterranean from South Africa. Melanthiaceae and Liliaceae crossed the Bering land-bridge several times from the Miocene to the Pleistocene
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