STAURASTRUM. 47 



('Desm. Perthshire,' 1877, p. 5 (sep.)) that his Desmid '"'nearly' 

 agreed with the figure of Reinsch lead one to understand that 

 the Scottish specimens were not identical with those of Reinsch, 

 and were perhaps more in agreement with Heimerl's later 

 described species. Roy also records a Desmid under the name 

 of St. Reinschii from Mull, and with zygospores from Glen Coe. 

 In no case, however, are figures given. Thus, in view of the fact 

 that Roy himself states that the specimens originally seen by 

 him were not absolutely identical with Reinsch's figures, the 

 writer is inclined to think that whether or not St. Reinschii 

 Roy actually exists as a valid species, all British specimens at 

 any rate recorded under that name have in all probability 

 belonged to St. Simonyi Heimerl. Until a Desmid complying 

 with Reinsch's figure and description has been accurately figured, 

 therefore, St. Reinschii Roy has provisionally been omitted from 

 the British list, The matter is further complicated by the fact 

 that both Cooke (' Brit. Desm.' 1887) and De Toni ( Syll. Alg.' 

 1889) have in their descriptions of St. Reiiischii united the 

 characters of two of Reinsch's species, those figured in ' Contrib. 

 Alg. Fung.' 1875, t. 17, figs. 4 and 5 respectively. These are two 

 distinct species according to Reinsch, and fig. 5 only represents 

 St. Reinschii. 



72. Staurastrum cristatum (Nau.) Arch. 

 (PI. CXXXIX, fig. 5.) 



Phycastruni (Pachyactinium) rristalum Xag. Gatt. einz. AL'. 1849, p. 127, 

 t. 8, C. f. 1. 



Staurastrtu/i it it id it nt Arch, in Quart. Journ. Micr. Sc-i. 1860, p. 78, t. 7, 

 f. 3, 4 ; Rabenh. Krypt.-fl. Sachs. 1863, p. 193. 



.sy. rri.sttitiiiii Arch, in Pritch. Infus. 1861, p. 738; P.abenh. Flor. Europ. 

 Alg. 1868, p. 215 ; Nordst. Desm. Spetsb. 1872, p. 40 : Jacobs. Desm 

 Danemark, 1875, p. 208, t. 8, f . 25 ; Kirchn. Alg. Schle.s. 1878, p. 170 

 Cooke, Brit. Desm. 1887, p. 144, t. 50, f. 7 ; Hansgirg, Prodr. Algenfl 

 Bohm. 1888, p. 215: De Toni, Syll. Alg. 1889, p. 1148: Borge, Bidr 

 Sibir. Chlor. 1891, p. 10 : West, Alg. W. Ireland, 1892, p. 173, t, 22, f. 16 

 Alg. Engl. Lake Distr. 1892, p. 18 ; Pvoy & Biss. Scott. Desm. 1893, p. 19 

 Borg. Alg. Faeroes, 1901, p. 233 ; Comere, Desni. de France, 1901, p. 167, 

 t. 13, f. 20 ; West & G. S. West, Alga-fl. Yorks. 1902, p. 98 ; Kaiser, 

 Algenfl. Traunstein u. Chiemgau, II, 1914, p. 158. 



Didymidium XaegeUanum Reinsch, Algenfl. Frank. 1867, p. 167. 



Staurastrum Xordstedtii Gutw. Wahr. d. Prioritat, 1890, p. 72 ; Flor. Glon. 

 Okol. Llowa, 1891, p. 71, t. 3, f. 22. 



Cells small, about as long as broad, excluding the 

 spines, constriction fairly deep, sinus acute, opening 



