36 Rhodora [February 



poriiinth cylindricjil or barrol-sluiped, terete (or slio;htly ])licate in the 

 U|)i)er part), contracted into a tubular beak; perio;onial bracts with a 

 tliird dorsal tooth. Schitfner recofrnizcs seven species, five of whicli 

 have been recorded from North America. L. Muclleri is distinjjuished 

 from its allies by its relatively small size, by its more or less acute leaf- 

 lobes, by its rather thin-walled leaf-cells with small but distinct tri- 

 gones and a minutely verruculose or striate cuticle, by its dioicous 

 inflorescence and by its lack of ojemmae. Its nearest relative is doubt- 

 less /.. heterocolpa (Thed.) M. A. Howe, which is known in North 

 America from Greenland, from the shores of Lake Su])erior, and, 

 in the Pacific Coast n^^non, from \'uk()n to California. This species 

 is a little lar<:er than /.. Muclh-ri, {\w lobes of its leaves are commonly 

 obtuse, and it jiroduces ^ennnae iibundantlv. Among New England 

 sjK'cies L. rxcisa and L. irnfn'cosa both bear some rescTublance to L. 

 Mucllrn. These species, however, are destitute of underleaves and 

 their perianths are widely open and dentate at the mouth. Other 

 members of tlii' /.. M urJIeri-^y^\\n\\> arc [)erhaps to be expected in New 

 England, esjHH-ially in limestone districts. 



3. Ix)i'iioziA i'()Ri>nvR()LE(;cA (Nees) Schiffn. Lotos 51: (Gl). 

 1903. Junrjrnnantiia porphi/rolcuca Nees, Naturgeschichte der europ. 

 Leberm. 2: 78. 183(). J. ventricosa, b. porphyroleuca Limi)r. ; 

 Cohn, Krypt.-Flora von Schlesien 1: 2S0. 1870. Mt. Bigelow, 

 Maine (J. F. Collins' and M. L. Frrnald, 14!)S, h')7S). White Moun- 

 tains {W. Oakr.s). (Juilford. New Hamj)shire (Mrs. Corter). 

 Although this species was recorded from New p::ngland by Austin^ 

 many years ago, it has received but scant attention from North Amer- 

 ican wntcrs and has usually been considered a simple synonym of 

 L. rnifn'rosa. K\vn in I^urope it has been looked ui)on as a s]h>- 

 cies of doubtful validity. When Arnell- studied the forms belonging 

 to the rrnfriro.s-a-crrnup a few years ago he found that the leaf-cells in 

 /.. porphi/rolrura had largc> trigones while those of L. ventricosa had 

 small (rigones or wcmv thin-walled throughout. Since these difl'er- 

 ences were inconstant and lie could find no others to support them, 

 he decided that L. porphi/rolrura was hardly worthy of specific rank. 

 Recently, however, Schiffner has shown that other differential 

 characters nuay be derived from the mouth of the perianth. In 

 L. porphj/rolrura this is sjilit into numerous acute lobes; the mar- 



'Proc. Arad. Pliihidelphia for 1869: 220. 



Uiot. Not. 1890: 194. E. Bauer has published a German translation of Arnell's 

 paper in Lotos 41. 1893. 



