TABLE 2.

Hyphal extension rates measured in experiments 1 and 4^a

Fungus	Treatment	Expt 1		Expt 4
		Slope	Standard error of slope	Slope	Standard error of slope
Pythium sp.	Dark control	0.335 x	0.006	0.370 x	0.010
	UV-B surface	0.197 y	0.039	0.030 y	0.011
	UV-B submerged			0.330 z	0.010
P. herbarum	Dark control	0.067 x	0.001	0.086 x	0.001
	UV-B surface	0.057 y	0.005	0.058 y	0.003
	UV-B submerged			0.076 z	0.001
M. parvispora	Dark control	0.080 x	0.003	0.091 x	0.001
	UV-B surface	0.000 y	0.000	0.000 y	0.001
	UV-B submerged			0.077 z	0.003
G. pannorum	Dark control	0.022 x	0.001	0.020 x	0.001
	UV-B surface	0.012 y	0.002	0.001 y	0.001
	UV-B submerged			0.012 z	0.001
Verticillium sp.	Dark control	0.025 x	0.001	0.026 x	0.001
	UV-B surface	0.009 y	0.001	0.004 y	0.001
	UV-B submerged			0.019 z	0.001

^aData were derived from three replicates (experiment 1) and four replicates (experiment 4) of each species per treatment. Slopes with different letters (x, y, and z) are significantly different (P < 0.05). Values for dark-held controls are means for surface and submerged hyphae. One-way analysis of variance indicated that these values did not differ (P > 0.05).