NOTES ON EECENTLY PUBLISHED DESMIDIE^. 337 C. Pseudoregnesii. As described in the paper cited, the latter is quite distinct from C. Regnesii Reinsch, which was there figured with it for comparison. Eeasons were given {I. c. p. 90, footnote) why jjolonicum" could not be adopted as the specific name. If the figure given by Schmidle for C. Regnesii var. montanum in Hedwigia really is C. Pseudoregnesii^ it is a very bad one. Prof. Schmidle has published a second figure (I. c. t. xv. fig. 11) of his var. montanum. and this agrees with C. Pseudoregnesii^ but if the original figure of Schmidle's is accurate, then his variety is not C. Pseudo- regnesii, and for this reason mention of his variety was not made in the footnote above referred to. Xanthidium alpinum Schmidle {I. c. p. 356, t. xv. fig. 9). This is identical in all respects with Sphcerozosma excavatum Ealfs var. Novm-SemlicB Wiile [Of vers, af Kongl. Vetensk.-Akad. Forhandl. xxxyi. p. 62, t. xiii. fig. 70 (1879)). Perhaps this is a Tetraedon, and not a Desmid. Staurastkum dejectum Breb. forma Borge (Bihang till K. Sveiisk. vet.-akad. Handl, xxi. afd. 3, p. 24, fig. 14). These are forms of S. glabrum (Ehrnb.) Ralfs. S. Dickiei Ralfs var. parallelum Borge (/. c. p. 23, fig. 13) non Nordst. [Freshiv. Alg. New Zeal. S Austr. p. 39, pi. iv. fig. 15). The examples figured by Borge are in our opmion forms of S. lanceo- latum Arch. S. subavicula West [Journ. Roy. Microscop. Soc. 1894, p. 12). S. arcuatum Nordst. subsp. subavicula West, Journ. R. Microsco]). Soc. 1892, p. 732, pi. ix. fig. 25. S. arcuatum Nordst. var. vasta Schmidle, Hedwigia, xxxiii. 1894, p. 94, t. vi. fig. 7. S. vastum Schmidle, Oesterr. Bot. Zeitschr. 1896, 59. The species described by Schmidle is precisely the same as the one we described from Brandreth, in the Lake District, in 1892. S. sparese-aculeatum Schmidle (/. c. p. 60, tab. xvi. fig. 20). Is this not a small form of S. Ravenelii Wood ? It seems to agree well with many specimens of the latter species we have examined from the United States. S. POLYTRicHUM Pcrty var. alpinum Schmidle [Hedwigia, 1895, p. 81, taf. 1, fig. 20). This is a fairly typical specimen of S. teli- ferum Ralfs. British specimens of S. teliferwn do not always agree with Ralfs' figures in having the spines only at the angles, the majority of examples having a few spines between the angles. The angles of S. teliferum are always broadly rounded (as figured by Schmidle) ; those of S. polytriclium are acutely rounded. S. trapezicum Boldt. var. campylospinosum Schmidle (/. c. fig. 25). This is only a form of S. i^yramidatum West, a very frequent species in upland districts. S. MEGALONOTUM Nordst. forma hastata (Liitkemuller) Schmidle [Oesterr. Bot. Zeitschr. 1896, 72, t. xvii. figs. 6 and 7). Fig. 7 is but a form of S. spongiosum Breb. S. ALTERNANs Breb. var. coronatum Schmidle {Hedwigia, 1895, p. 82, fig. 24). This does not belong to S, alternans, but is a variety
