NO. 2 drouet: myxophyceae 25 



the method of drying the specimens. Morphologically the plants 

 referred to Lyngbya epiphytica here cannot be separated from speci- 

 mens from both fresh and salt water collected at Woods Hole, Massa- 

 chusetts. Setchell and Gardner (ibid.) have reported the species from 

 Guadalupe Island, Baja California. 



Lyngbya gracilis Rabenhorst var. monilis (Setchell & Gardner), 



comb. nov. 



Phormidium monile Setchell & Gardner, Proc. Calif. Acad. Sci. 

 ser. 4, 19: 119. 1930. 



Caespites ad sesquicentimetra alti, floccosi, lubrici, siccitate sordide 

 aeruginei aut lutei, variis algis affixi, fills elongatis saepe parallelis, 

 rectis aut flexuosis, 7ju, ad S/x crassis; vaginis conspicuis, arctis, non 

 diffluentibus, chlorozincico iodurato caerulescentibus; trichomatibus 

 dilute aerugineis, torulosis, etiam moniliformibus, 2.5/x ad 6/a (vulgo 

 3.5/1, ad 4ju,) crassis, apice non attenuata; articulis quadratis vel 

 diametro ad duplo brevioribus, 1.25/x ad 6/* longis, protoplasmate 

 tenui granuloso farcti; cellula apicali rotundata, diametro saepe cras- 

 siore quam trichomate, membranam superne paululum incrassatam 

 praebente. Fig. 2. 



MEXICO: Baja California, Guadalupe Island, Herbert L. 

 Mason No. 95, [April 1925] (Type in Herb. Calif. Acad. Sci.); 

 Revilla Gigedo Islands, on Hydrocoleum comoides in tide pools above 

 high water, Braithwaite Bay, Socorro Id., No. 22, January 2-4; high 

 warm tide pools. Sulphur Bay, Clarion Id., No. 65, January 5. 

 COSTA RICA: on H. cantharidosmum in tide pools. Port Culebra, 

 No. 5S5> February 24. 



After a thorough examination of the original material from 

 Guadalupe Island upon which Professors Setchell and Gardner based 

 Phormidium monile,^ I do not have the slightest doubt as to the 

 identity of our own specimens. I propose here to establish this form 

 as a variety of the more widely distributed Lyngbya gracilis Rabenh., 

 with which Professor Geitler (Rabenh. Kryptogamenfl. 14: 1040. 

 1932) considers L. Menegheniana (Kiitz.) Gom. synonymous. Mor- 

 phologically the var, monile is separated from the typical variety by 

 the smaller size of the trichomes and the reaction of the sheaths to 



, 5 I am under obligation to Dr. J. T. Howell of the California Academy of Sciences 

 at San Francisco for permission to examine the type specimen of this interesting alga. 



