70 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[VOL. 11 



the cuticle smooth to minutely striolate-papillose ; cells of the segments and leaf 

 margins smaller. Underleaves smaller than the leaves, broadly ovate to orbicu- 

 lar, bifid to one-fifth or one-half of their length, the sinus V- or U-shaped, the 

 segments erect, the margins with sharp teeth in the upper half, or rarely entire. 

 Plants dioicous. Male bracts and bracteoles terminal but becoming intercalary 

 in position, in 12-15 series, similar to the leaves, the lamina concave ; antheridia 

 large, globose, in pairs in the axils of the bracts. Female inflorescence terminal 

 on the stem, the bracts and bracteoles similar to the leaves and underleaves, 

 larger. Perigynium to 5 mm long, arcuate. Sporophyte not seen. Fig. 4, a-e. 



Habitat: On soil. 



COLOMBIA: Bogota, Weir (as I. mascula) (NY); Antioquia, Bischhr 106 (COL). 

 BOLIVIA: 8.1., Herzog 2848, type of I. aequifoliata (G). 



PATAGONIA — TIERRA DEL FUEGO: Corral, Dusen 501 (NY, G), Dusen 507 (FH) ; 

 s.L, Krauze (as I. complicata) (8-PA), Krause (S-PA, G) ; s.l. X. Thaxter, as I. halleana 

 (FH), s.l., R. Thaxter 145 (as I. pollens) (FH) ; Valparaiso, Dusen 141 (NY); Talia- 

 huano, Dusen 203 (NY) ; Concepcion, Dusen 192 (NY) ; Valdivia, Hosseus 57 (as 

 I. leptodictyon), 840 (Hb. Herzog); Guaiteeas I., Dusen (NY); Chilloe I: Palmaiquen, 

 Junge 2220 (Hb. Herzog), Puerto Octal Dusen 531 (G) ; Puerto Bueno, Dusen 

 ■54 (as f. subintegra) (G) ; Puerto Frias, W. SchiUer (as I. striolata) (S-PA) ; Lago los 

 Santos Cayutue, Wolf hug el (as J. dentata) (S-PA) ; Riesco I., Skottsberg 133, type of I. 

 striolata (S-PA) ; s.l., Shottsberg 739, type of I. flavicans (G) ; s.l., Skottsberg 882, type of 

 I. fu-sca (G); s.L, Skottsberg, type of /. pollens (G) ; Straits of Magellan, Dusen 242 (G) ; 

 Desolation I., Puerto Angosta, Dusen 399 (NY) ; s.l., Dusen 400 (as f. subintegra) , Dusen 

 197 (G) ; s.l., Bescherelle 909 (VER) ; Cape Horn, ex Hb. Mitten (NY) ; Cape Horn, Hooker 

 (type NY, isotype BM); Staten I., s.L, Spegazzini 18 (VER); Cape Foster, without collec- 

 tor's name (BM). 



TRISTAN DA CUNHA: Christopherson # Meyland (as I. striolata) (S-PA). 



The additional reports in the literature include the following: Argentina (Kiihneinann, 

 1949), S. Chile (Herzog, Schwabe & Schwabe, 1939; Herzog, 1954; Stephani, 1900 a & b, 1901a, 

 1903a, 1911), Tierra del Fuego (Massalongo, 1885, 1927), and Cape Horn (Bescherelle & 

 Massalongo, 1889). 



5. Isotachis serrulata (Swartz) Gottsche, Ann. Sci. Nat. V. 1: 121. 1864. 



Jungermannia serrulata Swartz, Prodr. 143. 1788. 



Jungermannia serrulata swartziana Gottsche [?] in G. L. & N. Syn. Hep. 128. 1844. 

 Isotachis husnoti Gottsche ms. nom. nud. ; in Bescherelle, Jour. Bot. Morot 7: 124. 1893. 

 Isotachis swartziana Stephani, Spec. Hep. 3: 665. 1909. 

 Isotachis urbani Stephani, Spec. Hep. 3: 667. 1909. 

 Isotachis hahnii Stephani, Spec. Hep. 3: 668. 1909. 

 Isotachis paucidens Stephani, Spec. Hep. 6: 335. 1924. 



Isotachis woronowii Herzog, Beih. Bot. Center. 61(B): 566. /. 4, lc—s. 1942. 

 Isotachis piliflora Herzog, Beih. Bot. Center. 61(B): 568. f. 4, a-j. 1942. 

 Isotachis guadeloupensis Gottsche, ms. 



Plants very large, pale to dark red or reddish-brown, ascending to erect, 

 in deep tufts or cushions; stems very large, 5-10 cm long, with leaves to 3 mm 

 wide, irregularly branched ; stems in transverse section 14-16 cells across, the 

 cortical cells in one or two layers, very thick-walled, surrounding the larger, 

 thinner-walled cells of the medulla. Rhizoids not seen. Leaves patent, imbricate, 

 canaliculate, asymmetric, broadly ovate, bifid to one-fifth or one-fourth of their 

 length ; segments broadly triangular, acute, the sinus U- or V-shaped, more or 

 less toothed on the outer margins, the teeth short ; margins of the lamina entire 

 or with a few scattered teeth ; cells of the median part of the leaf 58-70 X 20- 

 25 fx,, the walls with conspicuous intermediate thickenings, the trigones large, 

 rounded, the cell lumina angular-rounded, the cuticle minutely to strongly 

 striolate-papillose ; cells of the segments and margin smaller. Fnderleaves ob- 



