Tendo : CORALLINAE VER^E. 713 



between the tidal marks as well as in the pools. Amphiroa 

 tuberculosa and Amp. cretacea f. tasmanica are found at the 

 depth of 2-5 ft. below the low-water mark or the surface of the 

 pools : the former species assumes very diverse forms when it 

 is found at the margins of the pools, or between tidal marks. 

 So also do Corallina officinalis var. chilensis, and Cheilosporum 

 MacMillani ; but the latter two are not infrequently found in 

 more shallow water. Cor. vancouveriensis and its variety, on 

 the contrary, are in most cases found at the margins of the 

 pools, and in the region a little above the low-tide mark. They 

 are also found epiphytic on the shells of Mya which cover the 

 enormous area of the drained beds, thus making it easy to col- 

 lect the entire bunch of the plants. Cheil. frondescens is also 

 found in similar positions. ChciL planiusculum is also an in- 

 habitant of the pools, but slightly below the margins. When 

 it grew above the water mark the frond is mostly stunted, appar- 

 ently forming a granular mass. In the tide pools high above 

 the water-level Cor. aculeata is generally found ; water in such 

 pools is mostly brackish, at least during the ebb tide hours ; and 

 the plant seemed to be able to adapt itself to it. This might be 

 the probable cause why the ultimate articuli of the branches of 

 this species are insufficiently calcified. Nevertheless, Cor. van- 

 couveriensis, Cheil. calif ornicum, Cheil. planiusculum, etc., may 

 also be found in these brackish pools without any apparent modi- 

 fication in the characters of their fronds. Briefly speaking, Cor. 

 vancouveriensis is an inhabitant of the shallowest water, and 

 Amp. tuberculosa^ as it were, of the deepest. The latter view 

 may be corroborated by the fact that we often find the frag- 

 ments of Amp. tuberculosa growing attached to the holdfast of 

 Ncreocystis Lutkeana hauled up out of water 20-50 feet deep. 



Cor. pilulifera and its varieties which are abundantly found 

 in Kamtchatka and in the northern part of Japan could not be 

 found at Port Renfrew. Their places seem to be taken by 

 Cor. vancouveriensis and Cheil. planiusculum. The habitat 

 of these is much like that of the typical form of Cor. officinalis 

 or Cor. squamata. 



Cheil. frondescens which was described by Ruprecht* col- 

 lected in Unalaska is common at this coast. Areschoug f re- 



*Post. et Rupr.: Illustr. alg., p. 20. 



t Aresch.: in J. Ag. Spec, alg., II., p. 549. 



