418 



Subgen. Pylaiella (Bory). 



96. E. littoralis (L.) Lyngb. emend. Kuckuck, Beitråge zur 

 Kenntnis einiger Ectocarpus-Arten der Kieler Fohrde, p. 7; Lyng])., 

 Hydrophyt., p. 130; Pylaiella littoralis Kjellm., N. I., p. 346 (281), 

 Handb., p. 83. 



var. opposita Kjellm., Handb., p. 84; Kuck., 1. c. p. 8. 

 var. firma Ag.; Kjellm., Handb., p. 84; Kuck., I. c. p. 8. 

 var. divaricata Kjellm., Handb., p. 85; Kuck., Le. p. 11. 

 var. varia (Kjellm.) Kuck., 1. c. p. 12; Pyl. varia Kjellm., N. I., 

 p. 348 (282), tab. 27, figs. 1— 12; Handb., p. 83. 



I think I have been able to discern some of the forms referred 

 by Kjell man and Kuckuck to each of the above-mentioned 

 main groups. 



Thus, of var. opposita I have found, besides the typical form, 

 f. rupincola Aresch. (Kjellm. and Kuck., 1. c.) and a few specimens 

 which agreed fairly well with Kuckuck's descriptions of f. subverti- 

 cillata and f. rectangnlans. 



Of var. firma, besides f. typica, some specimens were found 

 which seemed to answer to Kuckuck's description of f. subglomerata. 



Of var. divaricata, I think I have found, besides the typical 

 form, f. ramellosa Kuck., 1. c, and f. prætorta Kjellm., 1. c. 



Of var. varia, which occurred at a single place only, I have 

 only found the typical form. 



Lyngbye mentions in Hydrophyt., 1. c. p. 131, tab. 42 C, a 

 8 protensus of which there are several specimens in his herbarium 

 in Copenhagen, some of which are like var. opposita, while others, 

 judging from the very much decayed material, appear to belong to 

 other Ectocarpus-species. 



This alga, which is one of the most common along the coasts 

 of the Færoes, occurs both in the littoral zone and in the sublittoral, 

 but usually not at any great depth. 



On exposed coast in damp clefts and fissures in the rock, 

 especially in piaces where fresh-water oozes out, it can grow at a 

 considerable height above high-water mark (upwards of 10 feet). 



This plant occurs sometimes as an epiphyte, sometimes as a 

 dense, brown covering on rocks; it is found abundantly at the exit 

 of the streams. Var. varia was found in loose examples amongst 

 other algæ. 



Plurilocular sporangia occurred in May, June, July and Oc- 



