106 Rhodora [June 



intermixed, as in the type. Floating in a water trough, Berkeley, 

 California, Mareh 4, 1905. A". L. Gardner. 



1267. Enteromohi'Ha micrococca Kiitz. fonna bullosa, n. t". 

 Habit exactly like K. iutr.'ifiiinli'.t /. hiillom Hauek, Phyk. I'niv., Xo. 

 519, but structure of E. mirrorocra. In fresh water creek enij)tying 

 into ocean, but water never other than fresh, San I^eandro, Alameda 

 County, California, June 24, 1902. II'. J. T. Osterhout <t- .V. L. 

 Gardner. 



1185. Prasiola Gardneri, n. sp. Fronds light green, floating, of 

 irregular form, membrane very delicate, about .00(5 mm. thick, cells 

 roundish, .003-. 004 mm. diam., closely set, in longitudinal and trans- 

 verse series. As this plant has been found only floating, nothing is 

 known of the nonnal form or mode of attachment. The cells being 

 uniformly placed, without the "passage ways" characteristic of 

 Prasiola, the plant might with some reason be placed in Monos- 

 iroma; and when the attached frond is found, it may have characters 

 requiring the transfer. In the meantime, the general ajipearance 

 seems to justify its present position. Floating in a pool of very salt 

 water, Alameda, California, Sept. IG, 1903. U'. J. F. Osferhoui d- 

 N. L. Gardner.^ 



064. Chaetomorpha Californica, n. sp. Filaments attached, erect, 

 up to 2 dm. long, of uniform diameter throughout, not contracted 

 at the nodes; diameter .02-. 04 mm., cells once to twice as long as 

 broad, rarely three or four times as long; basal cell usually colorless, 

 slightly broadening below into a colorless disk of attachment. In 

 view of the large number of described species of Chaetomorpha, many 

 known only from the descriptions, it may seem rash to add one more; 

 but the plant now in (piestion is much more slentler than any other 

 known attached erect species; an examination of a large suite of 

 specimens shows that while a considerable range of size can be seen 

 in the same tuft, in no case does the diameter exceed .04 nnn., while 

 the average is .03 mm., about half the size of the smallest heretofore 

 known. Growing on sand, etc., in shallow tide pools near high water 

 mark, I.a JoUa, San Diego County, California, May, 1898. Mrs. E. 

 Snyder. 



978. Cladophor-A. flexuosa (Griff.) Harv. forma Floridana, 

 n. f. More slender than the New England form represented by Far- 

 low, Anderson & Eaton, No. 200, and with more virgate, less divided 

 branches; somewhat resembling C. Brriolonii var. hamosa Ard. of 

 the ^lediterranean. On rocks. Key West, Florida, March, 1897. 

 Mrs. G. A. Ila/L- 



1 Subsequent study of tliis plant by Mr. Gardner Indicates tbat its affinities may be 

 witii tlie Cyanophyceae ratlier than witii tlie Chlorophyceae. 



2 1 am iiidelUed to Dr. E. Hon\et for calling^ my attention to tlie resemblance between 

 thi.s plant and C. polyncnntha Moiuugne, Ann. Sci. Nat., Series 3, Bot.. Vol. XIV, p, 

 283, from Guiana, and for a fragment of an authentic specimen : the numerous slender, 

 pine-like, largely oi)posite raiuuli are cliaracteristic of both, and it now seems safe to 

 efer the Florida plant to Montague's species. 



