6? 



lets which end in the hairs characteristic of the trichothallic growth 

 of Striaria. They arise from the cortical cells, which divide irreg- 

 ularly, and increase in size so that they project in well-marked 

 papillae, above the surface. The general shape of the sporangia is 

 ovoid, but, when several contiguous cells are transformed into spo- 

 rangia, they become cuboidal or prismatic by pressure. Judgmg 

 from Mr. King's specimens, the plurilocular plant of Striarta is 

 smaller, finer, and less fully fleveloped as to the frond, than the 

 unilocular plant. Whether the plant which bears plurilocular spo- 

 rangia continues to grow, and afterwards produces unilocular spo- 

 rangia, I have no means of determining, but such is apparently not 



the case. 



Another interesting plant sent by Mr. King, but only m a very 

 small quantity, is closely related to Capsicarpella speciosa, Kjellm., a 

 species afterwards removed from Ectocarpeae by Kjellman (Algen- 

 vegetation des Murmanschen Meeres, p. 29), who believes that the 

 unilocular sporangia contain a single spore, and not numerous zoo- 

 spores, and consequently places the species, with one other, in a new 

 genus Scap/wspora, under the Tikpterideae. I have examined one 

 microscopic preparation and one pressed specimen sent by Mr. 

 King, and in both there are unilocular and plurilocular sporangia, 

 which, in general, resemble Kjellman's figure of C. speciosa (Bid. 

 Skand. Ectocarp. och Tilopter, pi. i. fig. 3), but which are smaller than 

 the measurements given by Kjellman. Our species more nearly re- 

 sembles, as far as measurements go, Sc arctica, Kjellm., but is appar- 

 ently smaller. The species may be provisionally described as new, 

 although farther comparison may show it to be a form of one of the 

 two species mentioned. Furthermore, although in as good condi- 

 tion as is usually the case with mounted specimens of this group of 

 algae, it is impossible to say whether the contents of the unilocular 

 sporangia form a single spore or are going to divide into numerous 

 zoospores. Assuming the former to be true, our plant would come 

 under Scap/iosphora, and is the only representative of the Tilopte- 

 rideae yet found on our coast. 



ScAPHOSPORA (?) KiNGii, Farlow.— Main filaments 4 inches long, 

 loosely aiTd' irregularly branching, cells 70/^-75/^ broad, usually 

 shorter than broad, secondary branches short, revolute, beset with 

 numerous secund, pectinately-compound branchlets, which end in 

 long hairs. Unilocular sporangia borne on the penultimate branch- 



, compressed-globose, 45/^-58/^ i" diameter, solitary, produced by 

 -. division of a branch-cell into two parts. Plurilocular sporangia 

 borne on the ultimate branchlets, 35/^-4°;^ broad, 75/^-150// long. 



Washed ashore at Edgartown, Mass. .Rev. J. D. King, January, 



1882. 



In the month of August, 1881, I collected at Wood's Holl, Mass., 

 a Gloeocapsa, which, at the time, was growing m considerable quan- 

 tity on the eel-grass, but which soon disappeared. I had seen it 

 occasionally in previous years, but never before in condition to de- 

 scribe. Its color is almost precisely that of hymg diatoms, for 



which'it might pass in the masses of slime in which it generally occurs. 



lets 

 th 



