206 Evans: Notes on genus Herberta 



In thus restricting the range of the latter species, writers differ 

 markedly from Dumortier.* He considered that his Schisma 

 stramineiim, under which he included S. Setidtneri Nees as a syno- 

 nym, grew in Scotland, as well as in Austria and Germany. His 

 species, in fact, was based on Scottish material. Apparently his 

 only recent follower is Lett,t who admits both H. adunca and 

 H. straminea as members of the Scottish flora. 



Botanists have long recognized the fact, however, that H. 

 adunca includes two well-marked forms. These were distinguished 

 by Gottsche,! as long ago as 1862, under the names, oc Dicksoniana 

 and ^ Hutchinsiae. He applied the first name to the plant with 

 shorter, erect-spreading leaves, having straight acuminate di- 

 visions, and the second to the plant with longer leaves, hooked when 

 dry and squarrose when moist, having lanceolate, incurved di- 

 visions. He considered that a Dicksoniana was primarily a plant 

 of Scotland while /3 Hutchinsiae was primarily a plant of Ireland, 

 and yet he made no attempt to restrict the range of either form 

 definitely. Carrington,§ in taking up the name ^ Hutchinsiae, 

 implies that all the Irish specimens are referable to this form and 

 states that the species grows at much lower altitudes in Ireland 

 than in Scotland. He adds that both forms grow in Scotland, 

 the form with ovate or ovate-lanceolate leaves being restricted to 

 higher and exposed mountains. This form is clearly Gottsche's 

 a Dicksoniana, although Carrington does not call it by this name. 

 He includes under it Dumortier's S. stramineum as a synonym and 

 calls attention to the fact that it approaches H. Sendtneri. Al- 

 though subsequent British writers have paid little attention to 

 Gottsche's names, Schiffner has recently revived them and applied 

 them to specimens in his exsiccatae.|| 



From a careful study of European specimens referred to H. 

 adunca, the writer has reached the conclusion that Gottsche's two 

 so-called forms represent two distinct, but closely related, species. 

 The form a Dicksoniana, as its name implies, represents the type of 

 Jungermannia adunca Dicks. In the absence of Dickson's original 



* Bull. Soc. Bot. Belgique 13: 125. 1874. 



t Hepat. British Isl. 177. 1902. 



X Rabenhorst, Hep. Eur. 210. 1862. 



§ Trans. Bot. Soc. Edinburgh 7: 454. 1863. 



II Hep. Eur. Exsic. 403-407. 1912. 



