— 22 — 



with the American specimens, as does Breidler's plant communi- 

 cated by the author. But this is a matter for European students 

 to settle. It is a matter of satisfaction for American students to 

 be sure that the plant in question is true Griinmia teretinervis 

 Lirapr, and the writer desires to thank both the author and 

 Mrs. Britton for kindly sending specimens, without which this 

 problem could not have been settled. 



The description of Grimmia teretinervis, is translated from 

 Limpr., Laubm., i: 717, 718. 



297. ScHiSTiDiUM (?) Teretinerve (Limpr.) Synonym; Grim- 

 mia {Eugrimmia'!) teretinervis Limpr. in 61. Jahresb. d. schles. 

 Ges. p. 216 (1884). Dioicous, known only in female sterile plants. 

 Perhaps to be placed ne.\t to Grimmia comtnutata or G. ovaia. 

 Cushions blackish, more rarely dark -green, to 4 cm. {n diameter, 

 loosely cohering, in habit somewhat like G. commutata. Stems 

 1-2, rarely 3 cm. long, slender, unbranched, in cross section 

 showing large thin-walled parenchyma cells, small thick-walled 

 cortical cells and a little developed central strand. Leaves 

 firm, the lower erect patent, the upper appressed, but when 

 moistened becoming somewhat recurved, then also erect-patent, 

 from a decurrent oval base, lance linear, concave (1.2-1 3510111. 

 long and 0.4-0 45 mm- wide) with a slender, short, toothed hair 

 about 0.45mm- long; lower leaves hairless, or with a very short 

 hair point. Leaf margin plane, only at the base slightly reflexed. 

 Lamina toward base of one cell layer, in the middle .sporadically 

 bistratose, toward ape.^ bistratose for several cells from the mar- 

 gin, hence the unistratose areas on each side of the costa appear 

 as two well defined longitudinal strips. Costa stout, brownish; 

 biconvex, with 4-6 ventral cells, central cells alike, small. Leaf 

 cells similar throughout, with rather thick, yet even walls, not 

 unequally thickened, very small, roundish-quadrate, 0.007- 

 0.009mm. in size, only toward the base on each side of the costa 

 with a few rows of short rectangular cells. Female buds at ends 

 of branches, with 5-6 poorly developed archegonia (o 54mm long) 

 and a few pellucid paraphyses. Male plants and fruit not known. 



Winona, Minn., February, igoo. 



Keep watch of the different mosses in your locality and record 

 the date of the first appearance of the sporophyte and the date of 

 ripening spores. Be sure to collect specimens to verify your ob- 

 servations. 



