—75— 



■teres are normally ovate-lanceolate. The pores in the branch-leaves of 5. teres 

 are usually fewer and larger in proportion to the size of the cells, and there are 

 other minor differences. Somewhat intermediate forms cause difficulty however. 

 Lesquereux described in 1868 a S. squarrosulum from California^ which has by 

 most botanists been treated as a variety (form) of S. teres, rightly so I should 

 say from an examination of the original California specimens, though I have 

 ■also seen small specimens of S. squarrosum determined by botanists as 5. teres 

 var. squarrosulum. In fact I am inclined to think that 5. squarrosum under the 

 influence of unfavorable local, seasonal, or other circumstances reverts to a type 

 not easily separable from forms of 5. teres} I note that a Hungarian bryologist, 

 Peterfi, still retains S. squarrosulum as an independent species,^ but the porose 

 «tem-cortex which, if I understand aright, characterizes his only specimen is 

 quite abnormal for this group, nor do I find it present in our specimens of this 

 form. Warnstorf emphasized a "biologic" point as separating S. teres and S. 

 squarrosum-} that 5. teres (excepting its variety squarrosulum!) prefers open 

 moors, while S. squarrosum is found in shady places and at most along the edges 

 of swamps. The case is not dissimilar in North America, S. teres being found 

 often in widely extended masses in bogs or wet meadows at the bases of moun- 

 tains, etc., while S. squarrosum occurs commonly in irregular clumps in more 

 varied environment. I do not know however that the matter can be formulated 

 into anything like an absolute rule. S. teres is often strongly pigmented brown. 

 It is, so far as observed, dioicous and does not commonly fruit. Its distribution 

 is quite similar to that of S. squarrosum, reaching high latitudes in Greenland, 

 Labrador and Alaska and extending south to something like the southern limits 

 ■of glaciation, its southern limits as at present known extending through New 

 Jersey, New York, Michigan, Colorado, California. Further collections fixing 

 its southern limits more accurately are especially desirable. Its range in Europe 

 and Asia appears to be similar. 



12. Sphagnum squarrosum Crome, 1803. The date of publication (1800) 

 of this species given by Warnstorf and others seems to be doubly wrong in that 

 the number of the periodical in question did not appear until 1801 and that the 

 reference shows only a nomen nudum without description. A good description 

 and figure was given in 1804 by Weber and Mohr,"* the authors again ascribing 

 the species to Persoon. An adequate description appears however to have 

 been published the year before by Crome in connection with a set of moss- 

 exsiccati.^ So far as I know Crome did not ascribe the species to Persoon. 



1 Lesquereux's name had been applied earlier to European specimens, but without pubUshed 

 •description. 



2 Cf. also Loeske, Zur Morphologie und Systematik der Laubmoose 45. 1910. 



3 Peterfi Marton, Magyarorszag Tozegmohai: Ktilonlenyomat a "Novenytani Kozlemen- 

 yek. " 1904. 150. 



< Kryptogamenflora der Mark Brandenburg, 1 : 350. 1903. 



5 Naturh. Reise durch einen Teil Schwedens 129, pi. 2, fig. i ab. 



6 Cf . Dusen, Om Sphagnaceernas Utbredning 26. 1887; Lindberg, Europas och Nord 

 Amerikas Hvitmossor 43. 1882; Botanische Zeitung 2: 321 ff. 1803. 



