326 THE JOURNAL OP BOTANY 



D. capense, &c, as being dioicous (not autoicous) ; but C. Miiller 

 described it originally as autoicous. The Javan plant is described 

 by Fleischer as both autoicous and dioicous, which may perhaps 

 account for the discrepancy having arisen. 



The distribution of D. flexifolium may be summed up as 

 follows : — South Africa, Madagascar, East African Islands, India, 

 Java, New Caledonia, Australia, Tasmania, New Zealand, Pata- 

 gonia, Chile. 



The following, then, will be the synonymy : — 

 Ditrichum flexifolium (Hook.) Hampe in Flora, 1867, p. 182. 



Dicranum flexifolium Hook. Muse. Exot., t. 144 (1820). — Non 

 Dicranum flexifolium Hornsch. e Schwaegr. Suppl. ii., 115 

 (1826). 



Trichostomum laxifolium H. f. & W., Fl. of N.Z., ii. 72. 



Ditrichum laxifolium Mitt, in Trans, and Proc. Roy. Soc. 

 Victoria, 1882, p. 51. 



Leptotrichum affine CM. in Bot. Zeit., 1847, p. 825. 



Cynontodium affine Mitt. M. Austro-Amer., p. 42. 



Ditrichum affine Hampe, op. cit. 



Trichostomum setosum H. f. & W., Fl. of N.Z., ii. 73, t. 84. 



Leptotrichum capense CM., Syn. i. 453. 



Ditrichum capense Par. Ind. p. 392. 



Leptotrichum plicatum CM. Syn. i. 446. 



Didymodon plicatus Mont. Syll., p. 49. 



Didymodon cirrifolius Mont, in Ann. Sc. Nat., 1842. 



Ditrichum plicatum Hampe in Nuov. Giorn. Bot. Ital., 1872, 

 p. 273. 



Leptotrichum Boryanum CM., Syn. i. 452. 



Ditrichum Boryanum Hampe in Fl., loc. cit. 



Trichostomum difficile Duby, in Moritzi, Verz. d. Zoll. Pfl. 

 p. 134. 



Ditrichum difficile Fleisch. Die Musci der Fl. von Buiten- 

 zorg, i. 300. 



Some Thuidia of Australasia and Oceania. 



Thuidium erosulum Mitt. Sam. M., p. 186 (1867). 



Paris, Ind., ed. ii., makes T. erosulum Mitt, a synonym of 

 T. faulense (Reichdt.) Jaeg. (Hypnum faulense Reichdt. in Verh. 

 d. K. K. zool. bot. Ges. in Wien, 1868, p. 196), on what authority 

 I am unaware. If the identity were established, it is obvious 

 that Mitten's name must be retained, and this has been done in 

 Brotherus, Musci, ii. 1013, where T. erosulum Mitt, is found 

 alone, no mention being made of T. faulense. 



T. erosulum belongs to a group of delicate species, having the 

 branching prettily plumulose, and marked by having the nerve 

 of the branch-leaves prominent in a ridge at the back, and more 

 or less cristate or toothed towards its apex. They are autoicous, 

 and usually have a scabrous seta. The cristate nerve is charac- 

 teristic also of certain more robust dioicous species. It is easily 

 remarked when the branch leaves are dry or only partially 

 moistened out, as they are then readily viewed in profile, but 



