334 NOTES ON FRESHWATER ALGiE. 



19. CosMARiuM Hammeri Rcinsch, forma abscissa Schmidle in 

 Hedici(/ia, xxxiv. 302, t. iv. f. 8 (1895). This form should certainly 

 be placed under C. retmiforme (Wille) Gutw., as its characters agree 

 much more closely with the latter than with C. Hammeri. The 

 large basal angles of the semicells, the hollow on each side im- 

 mediately under the apex, the sharp apical angles, and the straight 

 apex, are characters which are essentially those of C. retmiforme. 



20. CosMARiUM Heimerlii Wcst & G. S. West (0. minutissimum. 

 Heimerl, non Arch.), var. tumidum, var. n. Var. angulis rotundi- 

 oribus ; a vertice visis in medio utrobique inflatis. Long. 9-10 /x ; 

 lat. 10-11*5 /x; lat. isthm. 2*5-3 fx; crass. 5*5 /x. 



Hab. West and North Yorkshire, in several localities. 



21. CosMARiuM nasutum Nordst. Zygospora globosa, spinis 

 brevis uncinatis obsessa, spina unaquaque ex base mamillata orienti. 



Hab. Cowgill Wold Moss, Widdale Fell, W. Yorkshire (with 

 zygospores). 



22. Spondylosium papillosum West & G. S. West in Trans. 

 Linn. Soc. hot. ser. 2, v. 43, pi. ix. f. 19, 1895. Schmidle states 

 in Nuova Notarisia, 1897, 69, that this species is the same as 

 '^ Spharozosma (Spondylosium) depressum, (Breb.) Rabenh." From 

 his references he has evidently been guided by the remarks con- 

 cerning the latter in Rabenhorst's Fl. Europ. Alg., De Toni's 

 Sylloge Algar., and Kirchner, Mikr. Pflanz. d. Siissw. Theil I. 21, 

 t. ii. f. 61, 1891, and not to have consulted the original Spo7idi/Josiiun 

 depression Breb. (Kiitz. Spec. Alg. 189 ; Mem. Sciences Nat. Cher- 

 bourg, iv. t. i. f. 1, 1856). Rabenhorst says, "cellulis . . . tuber- 

 culis tribus marginalibus," but Brebisson's figure shows three 

 tubercles within the apex and extending across the surface of each 

 semicell. What does Rabenhorst mean by " marginalibus " ? 

 Kirchner evidently thought he meant lateral margins, and figured 

 a plant under the name of Spondylosium depression, which is cer- 

 tainly Spondylosium. papillosum.. 



23. Staurastrum variabile Wildem. in Ann. soc. belg. microsc. 

 [Memoires] , 1894, t. xviii. Under this name M. de Wildeman 

 unites S. unicome W. B. Turner, S. ecorne W. B. Turner, and S. 

 scolapacinum W. B. Turner. Even if these three be accepted as 

 varieties of one species, why place them under a new name ? 

 Surely the literature of the subject is sufficiently intricate without 

 the addition of a new and useless name. If M. de Wildeman wished 

 to alter Turner's species, he should have adopted one of his specific 

 names and placed the other two under it as varieties. 



24. Staurastrum quadrangulare Breb. var. alatum Wille. The 

 form figured by Schmidle in Hedwigia, Bd. xxxvi. 23, cum fig. iv. 2, 

 1897, is S. contectum. W. B. Turner, var. inevolutum. W. B. Turner. 

 The var. alatum. described and figured by Wille (Bih. till K. Sv. 

 Yet.-Akad. Handl. viii. 21, t. i. f. 41) is also probably a form of 

 8. contectum, but this cannot be definitely determined from his figure. 



25. Staurastrum furcigerum Breb. var. crassum Schroder, 

 Forschungsberichten d. Ploner Biol. Stat. v. 32, t. iv. f. 6, 1897. 



