42 Uliodora [P'ehkx^\ky 



The known range of S. clcnfata extends thronjjliout nearly tlie whole 

 of Europe, and it has been collected in about half a dozen widely 

 scattered stations in North America. It has also been found in Japan. 

 In some respects it is intermediate between S. undulata and S. ncmo- 

 rosa, and it has not received general recognition as a species until within 

 the last few years. Its characters indeed are not altogether definite, 

 and Miiller includes forms under the var. ambiyiia (DeXot.) Massal., 

 which might be referred to either S. dentata or S. undulata. TyjMcal 

 forms of the species are deep purple in color, and they differ from S. 

 undulata and also from S. ncmorosa in the fact that the antical lobes 

 of the leaves scarcely arch across the stem. A full dcscri[)ti()n of S. 

 dentata may be found in Miiller's monogra])h, j)p. <)7 11.'), and it is 

 figured on plate 9. 



G. ScAi'ANiA GUACiLLs (Ivindb.) Kaalaas, Nyt. :Mag. f. Naturv. 

 33: 243. 1893. Martinrllla gracilis' lAndh. Not. Soc. F. et Fl. Fenn. 

 13: 3()5. 1874. Beech Mountain, Mount Desert, Maine (IV. G. 

 Farhw). The determination of these specimens was made by Pro- 

 fessor Farlow and afterwards confirmed by Muller. Very little is 

 known about the distribution of this species in North America, only 

 two other localities, Greenland and Cape Breton, having been recorded. 

 On the eastern side of tlu^ Atlantic its known range extends from Nor- 

 way to Spain, Italy and the Canary Islands, mainly along the coast. 

 Muller considers the sj)ecies to be essentially maritime. He describes 

 and figures it in his monograi)h, p]). 194-201, pi. 19a. S. graciUs 

 resembles S. nemorosa in many respects but its leaves have larger and 

 fewer teeth and its leaf -cells have larger trigones. An even closer ally 

 is S. Bolanderi Aust., of the Pacific Coast region. This species, how- 

 ever, is distinguished by the bunch of marginal cilia at the base of the 

 antical lobe. Certain writers take up for S. gracilis the Linnaean 

 name rrmpinata, but, as Muller shows, there is so much uncerlainty 

 as to the original application of this name that it seems advisable to 

 discard it altogether. 



7. Ptilidium pulcherrimum (Web.) Ilampe, Prodr. Fl. Ilercyn. 

 7G. 183G. Jungrrmanuia pulchcrrima Web. Spic. Fl. Goettingensis 

 150. 1778. Blcpharozia pulchcrrima Lindb. Muse. Scand. 5. 1879. 

 Ptilidium ciliare, var. pulcherrimum Warnst. Kryptogamenfi. der 

 Mark Brandenburg 1: 260. 1902. P. pulcherrimvm has been recog- 

 nized in Europe for a very long time, but there has always been a 

 difference of opinion about it. By some writers it is considered a 



