b THE MARTXE ALG.E OF GUER^^SET 



A. BTTLLOSUS Lam. (A. TifrneriUook.). [W. 4.] N. 2. E. 10. 



On stones. 

 Streblonema fasciculatum Thur. r. In thallns of Casfag- 



nea virescens. [E. 10.] N.W. 7. — (a.) var. si77iplex Batt. 



In thallus of Stilophora rhizotdes and I^emalion luhricum. 



E. 2, 3. W. 7. 

 S. Zanardinii {Tlct. Zanardinii Crn.). In thallus of Chy. 



kaliformis. [E. 6, 10.] E. 9. 

 EcTOCARPUS Valiais^tei Born. In thallus of C^stoseira eri- 



coides. Mrs. Humber. N.W. 4. 1900. 

 E. YELUTiNUS Kiitz. {Elachista velutina Phy. Br.). [N.W. 4.] 



S. 6. On Himanthalia lorea. 

 c.T. E. GLOBIFER Kiitz. {JEct. insignls Crn.). On Castagnea 



virescens. E. 8, 10. 

 E. MiTCiiELLiE Harv. {Ecf. virescens Thur.). [" In several 



places between E. 10 and S. 1."] On Zostera. 

 a. E. Crouanii Thur. {Ect.fenestratus Berk.), r. N.W. 8. On 



Polg. affinis. 

 E. CONFERA'OTDES Le Jol. c. W. 3. On other algse. — var. 



arctus Kjellm. {^Ect. arcins Kiitz. ei Ect. j^sendosiUcuIosus 



Crn.). c. and on Sacch. j^olyscJiides. 

 E. siLicuLOSus Kiitz. c. E. 2, 10, and on Lam. Cloustoni and 



other a]g?e. 

 E. FAscicuLATUs Harv. [N.W. 4. E. 2, 10. S. 5.] W. 5. 



On Lam. C/oustoni SLud Sacchoriza poly sch ides. 

 E. TOMENTOSUS Lyngb. E. 10. 

 G. E. HiNKSi^ Harv. On Sacch. polyschides. r. W. 1, 2. 



E. GRANULOSUS Ag. [S. 2.] S. 3. On Bho.pahnata. — (c.i.) var. 



refracta Batt. On Zostera. Dredged off Itl. 11. r. 

 E. SECUXDUS Kiitz. [N.W. 4.] W. 1. r. 

 Pylaiella littoralis Kjellm. a. and on Asco. nodosvm. — 



(cm.) var. varia Kuck. (P. varia Kjellm.). r. On Asco. 



nodosum and F. vesiculosus. E. 6. 



The var. varia is an intruder from the north ; its habitats 



are Invergordon, Isles of Cumbrae and Bute, Saltcoats, and 



Cromart}" Fii-th. I found several well-grown specimens 

 ^ parasitic on Fucas vesiculosus and Ascophylhim nodosum. 



According to Batters, " this i-are Alga forms loose entangled 



mats of a dark olive-brown colour, lying free on the bottom 



or hanging on other algae. The fronds are decompoundly 



branched, the branches s])reading at a wide angle ; the lower 



branches are clad short and patent. The short branches, 



consisting of 2-10 cells, are frequently terminated by a solitarj^ 



sporangium. The unilocular sporangia are terminal, frequently 



sohtary, but chains of 2-10 are sometimes found side by side 



with the solitary ones." 

 Myriotrichia FiLiFORMis Harv. c. S. 3, 5, 7. On Cas- 

 tagnea virescens and Asp)erococcus Ji stulos2is . 

 M. CLAYJEFORMis Harv. On Asperococcus Jistulosus and 



Castagnea virescens. E. 2, 8. 

 Myrtactis pulyinata Kiitz. (FlacJtisfa attenuata Harv.). c. 



On Cystoseira ericoides. [E. 2, 10. W. 7.] N. 1. W. 5. 



