TABLE 2.

Laboratory cross-inoculation trials showing the percentage of galls successfully induced by symbiont self and cross-inoculations

Algal thalli used	% Gall formationb
	P. lanceolata	P. filiformis (Lufenholtz population)
P. lanceolataa	89 (48)	(45)
	89 (49)	(49)
P. filiformis (Lufenholtz population)	0 (43)	36 (42)
	0 (46)	40 (46)
P. filiformis (Carmel population)	0 (47)	0 (46)
	0 (47)	0 (47)
P. lyalli	0 (52)	0 (48)
	0 (59)	0 (44)

^aThese results are consistent with a previous investigation of gall induction on P. lanceolata (5). 

^bNumber of gall inoculations.