886 NEW OR CRITICAL BRITISH MARINE ALG;E. 



comes very near to L. fatiscens Aresch., from -wliich it is only to be 

 distinguished by the more pear-shaped unilocular sporangia, and 

 by there being only one chromatophore in each cell of the thallus- 

 lilaments, differences which do not seem to me sufficient to justify 

 the formation of a new genus. I may here mention that Mr. 

 Brebner has found at Bovisand Lithoderma fatiscens Aresch. with 

 plurilocular sporangia in every way similar to those figured and 

 described by Dr. Kuckuck from Heligoland specimens. 



7. Streblonema Buffhamianum, sp. n. Primary filaments 

 decumbent, creeping between the cortical filaments of the host 

 plant, much and irregularly branched, slightly nodose; cells 30-60 fi 

 long by 9 or 10 /x in diameter ; secondary filaments springing from 

 the creeping filaments, clavate, all of nearly the same length so as 

 to form an Elachista-like tuft ; cells at the base of the erect filaments 

 30 /x long by 9-15 /x in diameter, near the apices of the filaments 

 20-30 /x long by 15-25 /x in diameter. Sporangia oval or roundish, 

 30-45 /x long by about 30 /x in diameter, sessile at the base of the 

 erect filaments. In the cortical layer of Castar/nea Grijflthsiana. 

 Falmouth, T. H. Bujfham. 



Shortly before his death, Mr. T. H. Buff'ham sent me some 

 specimens of this plant, which he thought might prove to be a new 

 species of Strepsithalia. The plant seems to me to belong to an un- 

 described species, but, as the erect filaments are not imbedded in a 

 gelatinous substance, as in the genus Strepsithalia, I think it should 

 be referred to Streblonema. I have dedicated the species to the 

 memory of my friend, to whom British algology owes much. 



8. EcTOCARPUs VELUTiNus Kiitz. Spec. Ahj. 458, var. lateri- 

 FRUCTUs, nov. var. Unilocular sporangia very numerous, lateral, 

 borne on the erect free filaments, sessile or terminating lateral 

 branches, alternate or secuud, solitary or in pairs, in other respects 

 like the typical form. On Hi) aanthalia lor ea. Plymouth, G. Brebner. 



In the ordinary form of this species the sporangia are always 

 terminal on short, erect, usually simple, special filaments, while in 

 the variety described above they are nearly always lateral, and 

 either sessile or terminating lateral branches of the ordinary erect 

 filaments. The whole plant bears a very remarkable resemblance 

 to Sphacella subtilissima Eke., and, except that it does not turn 

 black when treated with eau de Javelle, it would be hard to say 

 how it differed from it. Mr. Brebner believes this is the ordinary 

 winter form of E. velntinus: but I cannot agree with him in this, 

 as, although I have seen many specimens of the species gathered in 

 late autumn and winter, I have never before seen anything like this 

 curious variety, nor has it, so far as I know, been met with else- 

 where in Britain or abroad ; and even the specimens sent to me by 

 Mr. Brebner himself much later in the year were not to be dis- 

 tinguished from the ordinary form, although solitary lateral sporangia 

 were very rarely to be met with on them. 



9. Acrochsetiuin endophyticum, sp. n. [L'Jiantransiclla endo- 

 phytica Brebner in litt.). A microscopic species, endophytic in the 

 cortical layer of Dasya coccinea. Primary filaments decumbent, 



