Table 2(a).

Measurements of epidermal cell length and width in roots of Lyginia barbata

				Root hair density*
	Root epidermal cell measurements*			Estimated from epidermal cell measurements†,‡		Counted directly§
Mean root diameter (mm)	Distance from root tip (mm)	Cell length (µm)	Cell width (µm)	No. mm−2 root surface	No. mm−1 root length	No. mm−2 root surface	No. mm−1 root length
1·5	2–5	36·8 (2·4)	18·5 (1)	1469	6918	1255 (61)	5898 (450)
2·0	∼50	67·9 (2·5)	22·1 (0·8)	666	4185	ND	ND

Values are means (s.e.) of n = 5 cells from each of six roots. ND, not determined.

* Measurements made on fresh and cryo-fixed field-grown roots.

^† Method 1 (see text).

^‡ Assumed that each cell develops a root hair.

^§ Method 2 (see text).