1.30 MINNESOTA BOTANICAL STUDIES. 



convolulo-imbricata, dimorpha : caulina magna, oblongo-lance- 

 olata, sensim late et obtuse acuminata, integra, circa 5 millim. 

 longa, 1. 5-1. 75 basi lata; ramea multo minora, strictula, ad 

 apicem ramorum curvatula et subhomomalla, anguste lanceolata, 

 marginibus inflexis pro more canaliculata, sensim obtusiuscule 

 acuminata, integra, 3-4 millim. longa, .5-. 75 basi lata. Cel- 

 luke alares subquadratee vel subhexagonae, parum dilatatce, cet- 

 era? lineares, subflexuosas, sat chlorophyllosEe, parietibus cras- 

 siusculis sat firmis, superiores breviores. Cetera ignota. 



This moss was discovered by Mr. L. M. Umbach, in the Des 

 Plaines river, Illinois, June 18, 1898. But I have recognized in 

 my herbarium some stems of the same plant collected in Sep- 

 tember, 1895, by Prof. Conway MacMillan in northern Minne- 

 sota, near the International Boundary, together with F. macmil- 

 lani, and which I referred erroneously to F. dichclymoides 

 Lindb. 



Fontinalis umbachi Card, is near F. missourica Card.,' from 

 which, however, it is easily distinguished by its shorter and 

 rather rigid stems, its more shortly acuminate stem leaves and 

 its rigid, canaliculate branch leaves, which are narrower at base 

 and entire at apex. F. holzingeri Card, is a softer plant with 

 more elongated and more flexuous stems and smaller stem 

 leaves. 



Charleville, France, November 1, 1902. 



Explanation of Plates. 



Nachet's objectives 1,3,5 an< ^ 6, oculars 1, 2 and 3, with camera 

 lucida. 



All drawings are reduced one fourth in photo-engraving. The 

 magnification indicated is true for the drawings as pri?ited. 



Plate XIX. 



Catharincea macmillani. 1. Entire plant, slightly enlarged. 2. 

 Stem section. 3. Two perichastial leaves. 4. An antheridium with 

 paraphyses. 5. A leaf apex showing dorsal teeth. 6, 7, S. Cells 

 from apex, middle and base of leaf. 9, 10, 11, 12. Leaf sections from 

 near apex to near base of leaf. 13, 14. Cells from leaf margin, more 

 enlarged. 15. Cells from lamina, more enlarged. 



Plate XX. 



1. Bryum minnesotense. a. Entire plant, nat. size. b. Stem 

 leaf, X 13. c. Branch leaf, X 13- d. Basal areolation, X 135- e. 



