130 Puget Sound Marine Sta. Pub. Vol. 1, No. 12 



PLATE 22 



24. Various mucronate tips of utricles on the same plant; a, young utri- 

 cle; b, c, d, intermediate forms; e, oldest stage. X75. 



25. Utricle with utricle hairs appearing. X75. 



26. Old utricle with collapsed tip; utricle hairs. X75. 



27. Utricle with scars of utricle hairs. X75. 



28. Utricle with single long utricle hair with plug in the base. X75. 



29. Utricle hairs in various stages on the same utricle. X75. 



30. Typical utricle with young utricle hair. X75. 



31. Type of utricle frequently found, with young utricle hairs (?) ap- 

 pearing. X75. 



g2. Utricle with utricle hairs. X75. 



