Descriptor : number of phloem strand
Descriptor type : categorical
Must be described on developed fvb (not on the fvb near the apex).
It is preferable to describe the central fvb.
In some stems, the phloem of the subcortical zone is in one piece and that of the central zone presents two parts isolated by sclerified cells. Only some of Calamoideae have two strands.
[legend of the figure 6]
A fibrous vascular bundle (fvb) with its different characters. AL = auricular lobe; AS = auricular sinus; dcap = fibrous dorsal cap; MS = median sinus; RP = radiating parenchyma; TP = tabular parenchyma; vasc = vascular; vcap = fibrous ventral cap.
a: Sagittata;
b: Cordata;
c: Complanata;
d: Reniforma;
e: Lunaria;
f: Vaginata.
2 phloem strands in the central zone
2 phloem strands in the central zone
2 phloem strands in the central zone
1 phloem strand
2 phloem strands
number of phloem strand
- one strand throughout the central cylinder
-
1
- one strand in the subcortical and transitional zones and two in the central zone of the central cylinder
-
In some stems, the phloem of the subcortical zone is in one piece and that of the central zone presents two parts isolated by sclerified cells.
1 AND 2 in the central part
1 AND 2 in the central part
1 AND 2 in the central part
1 AND 2 in the central part
1 AND 2 in the central part
- two strands throughout the central cylinder
-
Only observed in Calamoideae.
2
