Cryosophileae - Thrinax or Hemithrinax
Cryosophileae - Thrinax L.f. ex Sw. or Hemithrinax Hook.f. in G.Bentham & J.D.Hooker
Thrinax radiata
Thrinax radiata
Thrinax radiata
Hemithrinax compacta
Hemithrinax compacta
Hemithrinax compacta
Hemithrinax compacta
certain
- von Mohl's classification : Cocos-Type
- shape of fibrous part in transverse section : Vaginata
- cortex : developed
- superficial protective layer (sub-epidermal) : suberization and sclerosis of the existing ground parenchyma
- tangential elongation and anticlinal divisions of subcortical parenchyma cells : absent
- fibrous bundles in central cylinder : present ; absent
- fibrous ventral cap : present (often only in the central part)
- little fibrous vascular bundles (bridges) : present (well developed)
- number of phloem strand : one strand throughout the central cylinder
- radial elongation of the fibrous dorsal cap (in subcortical zone) : absent
- radiating parenchyma : absent
- ground parenchyma of the central cylinder : spheroid to slightly elongated (length / width < 3–4) cells (∅ < 150 µm) and compact [sometimes few and little lacunae in old stems
- ground parenchyma sustained growth : absent (Type A)
- phytoliths : globular echinate to granulate
- number of wide metaxylem element per fibrous vascular bundle : mostly 2 (3-4) ; mostly 3-4
- tabular parenchyma : present
- end wall slope : oblique ; slightly oblique
- specialisation value : 2 to ≤ 5 vessel-parenchyma pits">[3] multiple perforation plates with "medium size" perforations that span >2 to ≤ 5 vessel-parenchyma pits ; 5 vessel-parenchyma pits, or with ≤ 3 bars">[4] multiple perforation plates with "wide" perforations that span >5 vessel-parenchyma pits, or with ≤ 3 bars ; [5] mixture of multiples perforation plates (as in #4) and simple perforation plates
- wide metaxylem element : present
- fibrous dorsal cap centrifugal differentiation : absent
- metaphloem sieve plate : compound
- phytoliths distribution in central cylinder : all around the dorsal fibrous cap throughout the central cylinder
cortex
central cylinder
- fibrous bundles in central cylinder : present ; absent
- shape of fibrous part in transverse section : Vaginata
- little fibrous vascular bundles (bridges) : present (well developed)
- radiating parenchyma : absent
- tabular parenchyma : present
- ground parenchyma of the central cylinder : spheroid to slightly elongated (length / width < 3–4) cells (∅ < 150 µm) and compact [sometimes few and little lacunae in old stems
- ground parenchyma sustained growth : absent (Type A)
- superficial protective layer (sub-epidermal) : suberization and sclerosis of the existing ground parenchyma
- von Mohl's classification : Cocos-Type
- fibrous ventral cap : present (often only in the central part)
- number of wide metaxylem element per fibrous vascular bundle : mostly 2 (3-4) ; mostly 3-4
- number of phloem strand : one strand throughout the central cylinder
- radial elongation of the fibrous dorsal cap (in subcortical zone) : absent
- phytoliths : globular echinate to granulate
- end wall slope : oblique ; slightly oblique
- specialisation value : 2 to ≤ 5 vessel-parenchyma pits">[3] multiple perforation plates with "medium size" perforations that span >2 to ≤ 5 vessel-parenchyma pits ; 5 vessel-parenchyma pits, or with ≤ 3 bars">[4] multiple perforation plates with "wide" perforations that span >5 vessel-parenchyma pits, or with ≤ 3 bars ; [5] mixture of multiples perforation plates (as in #4) and simple perforation plates
- fibrous dorsal cap centrifugal differentiation : absent
- wide metaxylem element : present
- tangential elongation and anticlinal divisions of subcortical parenchyma cells : absent
- metaphloem sieve plate : compound
- phytoliths distribution in central cylinder : all around the dorsal fibrous cap throughout the central cylinder
fibrous vascular bundle
- shape of fibrous part in transverse section : Vaginata
- fibrous ventral cap : present (often only in the central part)
- number of wide metaxylem element per fibrous vascular bundle : mostly 2 (3-4) ; mostly 3-4
- number of phloem strand : one strand throughout the central cylinder
- radial elongation of the fibrous dorsal cap (in subcortical zone) : absent
- tabular parenchyma : present
- end wall slope : oblique ; slightly oblique
- specialisation value : 2 to ≤ 5 vessel-parenchyma pits">[3] multiple perforation plates with "medium size" perforations that span >2 to ≤ 5 vessel-parenchyma pits ; 5 vessel-parenchyma pits, or with ≤ 3 bars">[4] multiple perforation plates with "wide" perforations that span >5 vessel-parenchyma pits, or with ≤ 3 bars ; [5] mixture of multiples perforation plates (as in #4) and simple perforation plates
- metaphloem sieve plate : compound
- wide metaxylem element : present
- fibrous dorsal cap centrifugal differentiation : absent
- radiating parenchyma : absent
ground parenchyma
- ground parenchyma of the central cylinder : spheroid to slightly elongated (length / width < 3–4) cells (∅ < 150 µm) and compact [sometimes few and little lacunae in old stems
- ground parenchyma sustained growth : absent (Type A)
- superficial protective layer (sub-epidermal) : suberization and sclerosis of the existing ground parenchyma
- tangential elongation and anticlinal divisions of subcortical parenchyma cells : absent