192.)] Setchell-Gardner: Melanophyceae 639 



Alaria tenuifolia f. amplior S. and G. 



Stipe varying from 10-90 cm. in length, usually stouter than in 

 the last and usually as much flattened ; blade ample, 20-35 cm. wide, 

 10-15 dm. long, base generally distinctly cordate ; sporophylls broadly 

 ovate to oblong and cordate, each with a conspicuous stalk, frequently 

 very large, 45 cm. long, 25 cm. wide, sorus more or less orbicular and 

 covering only the basal third or fourth. 



Attached to piles and boulders near low water mark. Esquimalt, 

 B. C, and Roche Harbor, San Juan Island, Washington. 



Setchell and Gardner, Alg. of N.W. Amer., 1903, p. 274. 



■Yendo (1919, p. 98) has referred this species to A. Pylaii Grev. 

 and he may be right although J. G. Agardh's plant, so far as his 

 adult type specimen (cf. Yendo, 1919, pi. 8, fig. 1) is concerned, 

 resembles our f. longipes more nearly than f. typica, which is the 

 type of .4. tenuifolia. J. G. Agardh's Alaria Pylaii has been the 

 basis of all discussion of this species and is assumed by Yendo to be 

 the true .4. Pylaii. It is not the Agarum Pylaii Bory, however, nor in 

 any wise resembling it, but is possibly the Laminaria remotifoiia De la 

 Pyl. (L. Despreanxii of J. G. Agardh's herbarium is a different and 

 distinct species. W. A. S.) We have for some time been leaning toward 

 the opinion that the f. longipes with the truncate base to the blade 

 might be distinct from the typical form of A. tenuifolia. It is cer- 

 tainly a very distinct form (or perhaps rather variety) if this char- 

 acteristic is constant (as it is in all our specimens). It is important 

 to note that J. G. Agardh's plant (no. 2088 of his herbarium), repre- 

 senting his and the prevalent idea of Alaria Pylaii, is labeled "Al. 

 Despreauxii Bory. L. Pylaii de la Pyl, viz., Bory (musaefolia v. 

 remotifoiia Del.), Groenland, Sukkertoppen, S. Berggren," and that 

 this is the plant figured by Yendo (1919, pi. 8, fig. 1). A plant in 

 J. G. Agardh's herbarium (no. 2090), assigned also by him to Alaria 

 Pylaii, but very different from that just discussed, is labeled "Lami- 

 naria musaefolia Bory, Terre Neuve, Mr. Despreaux, 1828. ded, 

 Guillermin." This plant is entirely different from the Alaria Pylaii 

 J. Ag., as understood, as well as entirely different from the Agar urn 

 Pylaii Bory and probably also different from the Laminaria musaefolia 

 De la Pyl. 



These various considerations lead us to retain the name Alaria 

 tenuifolia for our plant and to retain both forms, typica and longipes, 

 under it for the present at least. What we consider to be the true 

 Alaria Pylaii (Bory) Grev. will be discussed below. 



