protoxylem
protoxylem defined in 1951 year
protoxylem - protoxylem;protoxylem - First xylem elements to be differentiated from pro-cambium; extensible. Described as endarch when internal to the later-formed metaxylem, e.g. in stems of angiosperms; exarch when external to metaxylem, e.g. in roots; and mesarch when surrounded by metaxylem, e.g. in stems of ferns.
near protoxylem in Knolik
| prototroph | home letter "P" start from "PR" | protozoa |
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