40 ANNALS OF SCOTTISH NATURAL HISTORY 



If. loreum, Dill. Common. 



NECKERA complanata, B. and S. Walls by Allan Water. 

 N. crispa, Dill. Dunkeld (Card.), Ben Lawers (hb. J. S.) 

 CRYPHCEA heteromatta, Dill. Bridge of Earn (J. S.) 

 FONTINALIS antipyretica, L. Ochil Glens (T. Lyle). 



ADDITIONAL AND EXCLUDED SPECIES. 



OREOWEISSIA surrulata, Funck. Ben Lawers (Dr. Stirton). 

 BRYUM Schiwpcri, Wils. Ben Lawers. 

 HYPNUM chrysopkyllum, Brid. Dunbarnie Links (Howie). 

 If. polygamum, B. and S. 



var. stagnatum. Dunbarnie Links (Howie). 



H. aduncum, Dill. (H. exanmdatum, Giimb.) Dunbarnie Links 

 (Howie). 



H. Kneiffii, B. and S. (H. adnncum, Hedw.) Dunbarnie Links 

 (Howie). 



H. Sendtneri, Schpr. 



ft Wilsoni. Dunbarnie Links (Howie). 



H. Starkii, W. and M. Ben Lawers (Hunt., 1865, in hb. J. S.) 



ON SCOTTISH DESMIDIE/E. 



By JOHN ROY, LL.D. 



[ Continued from page 245 (1893).] 



PLATE II. 



2. A. convergens, Ehr. General. 



3. A. Incus (Breb.), Hassall. General. Abundant in one or 



other of its forms, . and (3 Ralfs are not uncommon ; a 

 small form of a is very abundant, and very frequently con- 

 jugated. The form given by Grunow from " Insel Banka " 

 in Rabenh. "Beitrage," Heft II. p. 15, Taf. II. fig. 29, is 

 rare, but has been gathered abundantly on the Clova Table- 

 land, in Forfar, by Rev. J. Fergusson. 



Var. intennedius, Wittr. Widely diffused, but scarce. 



4. A. longicornis, n. sp. Rare. Like A. Incus, but differs in the 



very long, nearly parallel, or slightly diverging spines, and 

 (in front view) triangular semi-cells. Length, 26 /j. ; breadth, 

 with spines, 76/7.; isthmus, 8 /^. (Our Plate III. fig. i.) 



