42 THE JOURXAL OF BOTANY 



before the flower opens, numerous tetrads of pollen fall on the lip, 

 into the hypochile, etc., and probably thus become transferred to the 

 stigma. In the former the pollinla slide downwards bodily from the 

 anther-cells over the sloping upper edge of the stigma, and come 

 to rest obliquely on its frontal viscous surface, to which they become 

 anchored by an outgrowth of pollen-tubes, in much the same way as 

 described by H. Miiller {oji. cit.) in the case of the continental 

 viridijlora. 



THE GENUS HERBERTA 



AS REPRESENTED IX THE MaX^CHESTER MuSEUM. 



Br William Henry Pearson, M.Sc, A.L.S. 



Prof. A. W. Eyans of Yale University has done a great service 

 to British hepaticologists in his "Notes on the genus Herberta, with 

 a revision ot" the species known from Europe, Canada and the United 

 States" published in the Bulletin of the Torrey Botanical Chih for 

 1917 (pp. 191-22), wherein are described and figured two British 

 plants which have hitherto been considered as forms of one species — 

 Herherta adunca (Dicks.) and //. llutchinsice (Gottsche) Evans. 

 In 1862 Gottsche (Pabenhorst Hep. Eur. n. 210) discriminated the 

 two forms; Carringtonin his Gleanings among the Irish Cryptogams 

 (1863) has an interesting note in which he regarded H. adunca as a 

 form found only on high and exposed mountains ; the habitat he 

 thought accounted for the differences and he did not separate them. 

 Evans proves by the different characters that they may justly be 

 considered distinct : for full descriptions reference must be made to 

 his paper ; I merely give here the salient characters of the two 

 species. 



Herberta adunca (Dicks.). Leaves bifid to about one half; 

 divisions broad, slightly or not at all curved, acute or acuminate : 

 vitta not distinct, usually indistinct even in the basal region, extend- 

 ing for a short distance into the divisions, but coming to an end con- 

 siderably beloAV the apex. (The vitta or nerve is a band of elongated 

 cells which extend from the middle of the base of the leaves to the 

 segments.) Basal portion of leaf normally entire. 



Herberta Hutchinsi^e (Gottsche) Evans. Leaves bifid two- 

 thirds to four-fifths, divisions narrow, strongly curved, long-acuminate ; 

 vitta distinct, extending far into the divisions, but hardly to the 

 apices. Basal portion of leaves entire or nearly so or furnished with 

 a fev; teeth. Of this species Prof. Evans gives a plate. H. adunca 

 is recorded from Scotland and Wales ; H. Ilutchinsice from Scot- 

 land, England, Wales and Ireland : the further distribution of the 

 former is Norway and Faroe Islands, and of the latter, Norway-, 

 Alaska and British Columbia. 



Another European species — II. Sendtneri CNees) {Sendtnera 

 Sauteriana Nees, Schisma straminrum Dum.) — has been credited by 

 Dumortier and Lett to Scotland, but no specimens have been seen to 

 support fhe statement. A large form of H. adunca collected bY 

 C. Howie (near Loch Maree, llosshire) has been so named, but there 



