358 Pub. Puqet Sound Biol. Sto. Vol. 2, No, 53 



PLATE 59 

 Dcsmaresiia Ugidata (Lightfoot) Lamouroux. 



Fio-. 1. Tip of branch, showing crowded arrangement of assimilating 

 hairs. X 88. 



Fig. -2. Longitudinal section through midrib showing sieve tubes of central 

 axis, surrounded by inner assimilation tissue and conducting hyphae; 

 three pairs of lateral veins, originating from every third cell of central 

 axis; middle pair of lateral veins with secondary branches. X 88. 



Fig. 3. Same as fig. 2. X 88. 



Fig. 1. Cross section of main axis, showing arrangement of tissues. X 88. 



Fig. 5. Cross section of branch of first order, showing central axis with 

 pair of lateral branches. X 188. 



Fig. (i. Longitudinal section of branch of second order, showing branch- 

 ing in secondary branches of veins. X 88. 



l"ig. 7. Section of holdfast, showing two years' growth. X 88. 



