80 Rhodora [May 
in Wales, for example (Carrington € Pearson, Hep. Brit. Exsic. 124), 
which Pearson used for most of his illustrations, the leaves are distant 
and often greatly reduced in size but show no evidence of falling away. 
His other figures were drawn from specimens collected by Jack in 
Baden (Gottsche & Rabenhorst, Hep. Europ. /98, 401); the first 
was distributed under the name “ Mastigobryum deflexum var. Q 
flaccidum Nees” and the second under the name “M. deflexum d 
' Both show caducous leaves to a greater or less extent 
and also differ from the Welsh specimens in other respects. 
In 1912 Macvicar! followed the example of Pearson and recognized 
both " Bazzania tricrenata (Wahl.) Pears.” and “B. triangularis 
Pears.,” dating them from the year 1900. According to his account 
B. triangularis “can generally be separated in Britain without diffi- 
culty from B. tricrenata," and "the typical forms of the two plants 
never grow in the same patch." He described two principal forms 
of B. triangularis and a third, apparently less important, form. In 
the first the leaves are mostly distant, never falcate, and usually 
(but not always) acute, while the underleaves are oblong-quadrate 
and entire; in the second the leaves are approximate, sometimes 
faleate, and often two- or three-toothed at the apex; in the third 
the leaves are narrow, nearly flat, and frequently three-toothed. 
He brings out the additional fact that the cells of B. tricrenata are 
24-30 y in diameter, while those of B. triangularis are only 16-25 y, 
but makes no allusion to the early falling away of the leaves. His 
illustrations clearly represent the first of his three forms, which is 
essentially like the Welsh plant figured by Pearson, while h's second 
and third forms would agree better with Jack's Baden specimens. 
In 1914 Schiffner distributed specimens of Bazzania triangularis 
(Schleich.) Lindb. and * B. trierenata (Wahlenb.) Pears." in his Hep. 
Europ. Exsic. 637-650 and commented on them in the thirteenth 
series of his " Kritische Bemerkungen. ”? He expresses the opinion 
that these species are distinct in Scotland, but connected by transi- 
tional forms in the mountains of Central Europe. Under B. trian- 
gularis he issued Scotch specimens, illustrating Macvicar's first 
form, as forma laxa; French and Italian specimens, illustrating his 
second form, as forma densior; and Bohemian specimens, representing 
a new var. intercedens, stating, in regard to the last, that it might 
implexum.? 
! Student's Handb. British Hepaties 317, 318. 1912. 
? Privately printed at Gottesberg, Silesia. 
