350 University of California Publications. [botany 



The specimens included under this name, other than the type, 

 have been compared with an authentic specimen in Herb. Farlow 

 by F. S. Collins, who reports that they are of the same general 

 habit as the Ruprecht specimens, but that the latter are coarser. 

 We feel that it is reasonably safe to quote them under this species, 

 since there is no doubt but that the Iridcea pinna ta P. & R. is a 

 Grateloupia, with Norfolk Sound in the region of Sitka, Alaska, 

 for the type locality. Miss Tilden's specimen is young, but seems 

 certainly to belong here and has nothing in common with Oigar- 

 Una microphylla Harvey. The specimens collected at Port Ren- 

 frew have both cystocarps and tetrasporangia. This species has 

 nothing to do with Grateloupia pinnata (Hooker and Harvey) J. 

 Agardh, which, if retained in this genus, may, if we follow 

 priority, need a new specific name. 



Prionitis Lyallii Harvey. 



We have had the opportunity of examining the eotypes of 

 several of the forms of this species in Herb. Farlow and of com- 

 paring these with considerable material collected on the coasts of 

 Puget Sound and of California. We have come to the conclusion 

 that there exist at least four well marked species on the western 

 coast of North America, viz.: P. Lyalli Harvey, P. lanceolata 

 Harvey, P. angusta (Harvey) Setchell, and P. decipiens (Mon- 

 tague) J. Agardh. These have been distributed as follows: — 



P. Lyallii f. normalis — Collins, Holden and Setchell, P. 

 B.-A., No. 448!, Farlow, Anderson and Eaton, Alg. Exsicc. 

 Am. Bor., No. 24!; P. Lyallii f. gladiata — Collins, Holden and 

 Setchell, P. B.-A., No. XXV!; P. lanceolata— Farlow, Ander- 

 son and Eaton, Alg. Exsicc". Am. Bor., No. 81a! , Collins, Holden 

 and Setchell, P. B.-A., No. 199a!; P. angusta— Farlow, Ander- 

 son and Eaton, Alg. Exsicc. Am. Bor., No. 81B!, Collins, 

 Holden and Setchell, P. B.-A., No. XXIV! ; P. decipiens— Collins, 

 Holden and Setchell, P. B.-A., No. 199b! 



Prionitis Lyallii is to be distinguished by having its branches 

 and branchlets decidedly contracted at the base and more or less 

 gladiate. It approaches P. lanceolata too closely at times. Har- 

 vey has separated the various forms under a number of form- 

 names which are given below. They pass iuto one another by 

 insensible gradations. 



