Cryosophileae - Thrinax
Cryosophileae - Thrinax L.f. ex Sw.
Thrinax radiata
Thrinax radiata
Thrinax radiata
Hemithrinax compacta
Hemithrinax compacta
Hemithrinax compacta
Hemithrinax compacta
informative descriptor
- general stem pattern (ex-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 : absent
- fibrous part adjacent to the xylem : present (often only in the central zone)
- little fibrous vascular bundles (bridges) : present (well developed)
- number of phloem strand : one strand throughout the central cylinder
- radial elongation of the fibrous part (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 ; cells slightly elongated (length / width < 3–4), lobed with a random (rhombohedral) shape (maximal length < 200 µm) and irregular meshwork (lacunae < 200 µm)
- 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 part centrifugal differentiation : absent
- metaphloem sieve plate : compound
- phytoliths distribution in central cylinder : all around the fibrous part adjacent to the phloem throughout the central cylinder
- identification within "subfamily" or "tribe" : in all palm family ; subfamily Coryphoideae ; tribe Cryosophileae ; without Arecoideae
cortex
central cylinder
- fibrous bundles in central cylinder : absent
- shape of fibrous part in transverse section : Vaginata
- little fibrous vascular bundles (bridges) : present (well developed)
- radiating parenchyma : absent
- tabular parenchyma : present
- paravascular parenchyma : poorly developed or one layer of circumvascular cells
- 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 ; cells slightly elongated (length / width < 3–4), lobed with a random (rhombohedral) shape (maximal length < 200 µm) and irregular meshwork (lacunae < 200 µm)
- ground parenchyma sustained growth : absent (Type A)
- superficial protective layer (sub-epidermal) : suberization and sclerosis of the existing ground parenchyma
- general stem pattern (ex-von Mohl's classification) : Cocos-Type
- median sinus : rounded
- fibrous part adjacent to the xylem : present (often only in the central zone)
- 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 part (in subcortical zone) : absent
- phytoliths : globular echinate to granulate
- Tomlinson's end wall type : moderately specialized
- end wall slope : oblique ; slightly oblique
- range of slope index (min_m_max) : 3 – 3,76 – 4,33
- 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 part 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 fibrous part adjacent to the phloem throughout the central cylinder
fibrous vascular bundle
- shape of fibrous part in transverse section : Vaginata
- fibrous part adjacent to the xylem : present (often only in the central zone)
- 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 part (in subcortical zone) : absent
- paravascular parenchyma : poorly developed or one layer of circumvascular cells
- median sinus : rounded
- tabular parenchyma : present
- Tomlinson's end wall type : moderately specialized
- end wall slope : oblique ; slightly oblique
- range of slope index (min_m_max) : 3 – 3,76 – 4,33
- 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 part 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 ; cells slightly elongated (length / width < 3–4), lobed with a random (rhombohedral) shape (maximal length < 200 µm) and irregular meshwork (lacunae < 200 µm)
- 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