Evans: Notes on genus Herberta 213 



larly toothed near the base, the teeth mostly two to five on each 

 side, sometimes small, sometimes larger and lobe-like; vitta in- 

 distinct even in the basal region, extending into the divisions but 

 soon coming to an end, undivided portion about 0.25 mm. long 

 and 0.35 mm. wide; cells of vitta mostly 40-70 X 18 /x in the 

 basal portion and 30-40 X 16 ^ in the divisions, marginal cells 

 in the basal portion about 14 fx in diameter, cells between margin 

 and vitta about 16 /x in diameter; thickenings distinct in the ver- 

 tical walls, mostly 4-6 ju wide; cuticle distinctly striolate-verru- 

 culose, especially near the base: underleaves similar to the leaves 

 but shorter and more symmetrical: inflorescence unknown. 



The following specimens have been examined: 



Austria (Tirol): Kleiner Rettenstein near Jochberg, A. 

 Sauter (distributed as Sendtnera Saiiteriana in Rabenhorst's Hep. 

 Europ. jja); near Kitzbiihel, August, 1882, /. Breidler; Ross- 

 kogl, F. Arnold (distributed as Sendtnera Sauteriana in Gottsche 

 & Rabenhorst's Hep. Europ. 422) ; Sellraintal, August, 1912, H. von 

 Handel- Mazzetti (distributed as H. strammea in SchifTner's Hep. 

 Europ. Exsic. 468). 



Miiller and other writers cite the species from Bavaria and 

 Salzburg, as well as from Tirol. 



The present species bears a strong resemblance to the true 

 H. adunca and it is not at all surprising that botanists have some- 

 times had difficulty in distinguishing them. Both normally grow 

 in broad mats, their color is much the same except for the fact 

 that H. Sendtneri seems never to be tinged with red or purple, 

 their leaves are equally imbricated and divided to about the same 

 extent, their divisions are less curved than in most species of the 

 genus, and the vitta is poorly defined in both, the branches coming 

 to an end far below the apices of the leaves. At the same time 

 they exhibit excellent differential characters. The leaves in 

 H. Sendtneri are relatively broader than in H. adunca, the same 

 thing is true of the leaf-divisions, and the thickenings in the leaf 

 cells are less conspicuous, those in the vertical walls being only 

 about half as wide. The most striking differences between the 

 two species, however, are to be found in the basal teeth. In 

 H. adunca, as already noted, basal teeth are either absent alto- 

 gether or else occur as a rare abnormality. In H. Sendtneri they 

 form a conspicuous feature of the species. It is true that they 



