THE BROWN SEAWEEDS OF THE SALT MARSH. 325 
On tHE Brown SEAWEEDS or THE SALT Млвзн, — Parr II. Their 
Systematic Relationships, Morphology, and Ecology. By Saran M. 
BAKER, D.Sc., F.L.S., Quain Student at University College, London, 
and MAUDE H. BOILING [afterwards BLANDFORD], B.Sc., Fulneck School, 
Leeds.* 
(PLATES 28-30, and 18 Text-figures.) 
| Read 6th May, 1915.] 
CONTENTS. 
General Introduction 
PART 1.— Ох THE STATUS AND SYSTEMATIC RELATIONSHIPS OF THE MARSH Ессотрв. 
The common Rock Fucoids of the Littoral Zone in Britain .................. 327 
Velation of Marsh Species to Rock Species ...,............................ 328 
Marsh Forms of Petvetia ................... ............................ 328 
Marsh Forms of Ascophyllum ........... ........................... л... 329 
€ Forms s of Fucus (еее ии ee sa lll 330 
4 Derived from Fucus vesiouloous L. 
The Baltic Loose-lying Fuci. 
(c) Derived from Fucus ceranoides, L. 
Origin and Status of the Marsh Fucoids ............................ .. 345 
Proposed Nomenclature .......,.....,........,,,,..................... 346 
Table showing Relationships ...........,..........,.................... 348 
Diagnoses _......................................... . РАНАМА 349 
PART 2.—On THE RELATIONSHIP BETWEEN VARIOUS PHYSICAL FACTORS AND THE 
PECULIAR MORPHOLOGY or MARSH Fucorps. 
EE ‚....... 8355 
General methods employed for the Correlation of Factors ооо новини 356. 
(a) Dwar ot Habit TEE rr вовне А ee n 356 
A. Changes i in sanity 
В. Changes in Exposure. 
General considerations in favour of the conclusions, 
(b) Spirality or Curling .......... ee be eh eser ehh hh a 359 
Correlation between Spirality and Salt Access, 
Correlation between Nonspirality and (i. ) the Turf-like Habit, 
Gii.) Complete Immersion. 
Slight Movement of Marsh Fucoids by the Tide. 
The Case of F spiralis v. nana. 
The Curling of Р. ceranoides on Marsh. 
Possibility of Inheritance and Selection of Spirality. 
_ 
Blakeney Point Publications, No. 6. 
LINN. JOURN.—BOTANY, VOL. XLIII. '9 A 
