83 
Ittusr. Sull. Icon. Musc. 155. fl. 99. 1864. 
Exsic. Sull. Musc. All. no. 6. S. & L. Musc. bor. Am. ed. 2. 
no. 409. Aust. Musc. App. no. 300. Macoun, Can. Musc. no. 
269. | 
3a. THUIDIUM SCITUM ASTIVALE Austin, Musci App. 51. 1870. - 
Lhuidium aestivum Aust. Bull. Torr. Club, 5, 23. 1874. 
Thudium scitum var. aestivale Aust. Musc. App. no: 301. 1870. 
Flynum scitum var aestivale Lesq. & Jas. Mosses, of N. A. 323. 
1884. 
Stem more diffusely divided, less densely pinnate; perichetial 
bracts more abruptly filiform-acuminate; capsule célong-cylindrical. 
horizontal, wide-mouthed; cilia well-developed; teeth lanceolate, 
yellowish below; operculum more abruptly and shorter beaked; 
spores larger. 
Canada (Macoun); Ohio (Miss Biddlecome); New York 
(Howe, Peck) ; New Jersey (Austin); North Carolina (Small & 
Heller) ; Pennsylvania (Porter, Rau); Wisconsin (Cheney & True); 
Vermont (Grout.) i 
Exsic. Aust. Musc. App. no. 301. 
Rem. An evolute, as 7%. scitum is the involute form of the’ 
Same specific type. Both are neat, pretty mosses with finely 
granular leaves and very small papillae. 
4. THurpium rEcoGNiTUM (Hedw.) Lindb. 
flypnum vecognitum Hedw. Muse. frond. 4: 92. 1791. 
flypnum protensum Michx. Fl. Bor. Am. 2: 317. 1803. 
fTypnum tamariscinum var. recognitum Brid. Bryol. Univ. 2: 440. 
1827, . 
Thuidium delicatulum Br. & Sch. Bryol. Eu. Fasc. 49-51. 1852. 
Thuidium recognitum Lindb. Not Sallsk. pro Fauna et Flora — 
Fenn. Forh. 13: 416. 1874. Schimp. Syn. Musc. ed. 2, 614. _ 
1876, 
Rather large plants in intricate mats, dark green to yellow- 
brown; stem 5 to 19 cm. long, creeping or ascending, pinnately 
branched ; branches pinnate, spreading ; paraphyllia multiform; stem 
leaves ‘spreading-recurved, broadly triangular, abruptly acuminate, 
subauriculate-cordate, the papillate-serrate: margins usually plane, 
Sometimes recurved; the curved acumen thickened by the percur- 
_ Tent costa; leaf-cells unipapillate, not rarely bipapillate ipepinae ane 
