Descriptor : shape of fibrous part in transverse section
Descriptor type : categorical
Character defined by Stenzel (1904) and based upon the shapes of the median sinus, the auricular lobe and the auricular sinus. This descriptor is to observe in TS on the fvb of subdermal zone of the central cylinder. Sometimes a continuum exists from Sagittata to Reniforma in the same specimen, indeed, the sinus and the lobes of the fvb in the same TS do not have a constant shape. States Sagittata, Cordata, Complanata, Reniforma are generally associated with an exclude vascular part from the auricular lobe whereas, for the states Vaginata and Lunaria, this vascular part is included within the acute auricular lobes. The boundary between Lunaria and Vaginata is sometimes continuous.
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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.
shape of fibrous part in TS
Hierarchy
general stem pattern (ex-von Mohl's classification) | |_ shape of fibrous part in transverse section | |_ vascular zone position {Vaginata} | |_ auricular sinus {Vaginata} | |_ auricular lobe {Vaginata}