Fig. 6.

Settling speed (v_s) of the aspherical Sphagnum spores in relation to spore diameter, and the second-order polynomial regression (yellow curve) that gives the best fit for capsules with dark spores. For comparison, the theoretical settling speeds, according to Stokes' law, for spherical particles with the same density as water and with the given diameter (upper blue curve), and for spherical particles with 68 % of the given diameter (lower red curve), are presented. Error bars show the s.d.