(VOI..VI, 1922) FHANZ STiaMIAM. SPKCIKS FIKPATICAIUIM I.SOlacflis. 



breviter roLundata, apiee ad 1/3 inciso-biloba, sinu semirecto acuto, 

 laciniis lanceolalis aculis. 



Hab. Fuegia (Halle legit). 

 61. Isotachis heCorophylla St. n. sp. 



Sterilis mediocris rigidula, rufo-brunnea, pulvinatim caespitans. 

 Caulis ad 25 mni. longus, parum longeque ramosus, flagellis sparsis 

 longissimis. Folia caulina remotiuscula, oblique patula, canalicu- 

 latim concava, in plano ovata (2 mm. longa, medio 1,2.5 mm. lata) 

 normaliter symmetrica, ad 1/3 inciso-biloba, sinu semirecto, seg- 

 mentis anguste trigonis acutis ; adsunt folia trifida, laciniis externis 

 minoribus vel maxime inaequalibus. Cellulse supera? 27x27 [x 

 basales 27 x 36 ]x parietibius validis. Amphigaslria caulina foliis 

 simillima, sequimagna, semper bifida. 



Hab. Bolivia (Herzog legit). 



62. Isotachis laneiloha St. n. sp. 



Sterilis mediocris flavescens, rigidula terricola, dense depresso 

 csespitans. Caulis ad 4 cm. longis, sparsim longeque ramosus. 

 Folia caulina remotiuscula, oblique vel squarrose patula, condu- 

 plicatim concava, in plano late ovata (2 mm. longa, medio 1,33 mm. 

 lata), asymmetrica, transverse inserta, basi utrinque breviter cor- 

 datim ampliata, apice ad medium biloba, sinu semirecto obtuso, 

 lobis lanceolatis, longe cuspidatis subsequalibus. Cellul^ superse 

 27x27[jL, basales 27x45[jl parietibus validissimis. Amphigasiria 

 maxima, ovata (1,33 mm. longa, medio 1 mm. lata) fer ad medium 

 biloba, sinu semirecto, laciniis anguste triangulatis acutis, margini- 

 bus inferis utrinque tridenticulatis. 



Hab. Falklands Insulse (Skottsberg legit). 

 63. Isotachis obtusa St. n. sp. 



Sterilis magna robusta, fusco-brunnea, flaccida, profunde pul- 

 vinata, in rivuli laxe csespitans. Caulis ad 7 cm. longus, simplex 

 vel furcatus, validus. Folia caulina contigua, oblique patula, 

 canaliculatim concava, in plano reniformia (4 mm. lata, 3 mm. 

 longa) subsymmetrica, antice anguste decurrentia, apice ad 1/6 

 inciso-biloba, sinu recto obtuso, lobis late triangulatis obtusis. 

 Cellulse superae 27 x 54 [x, basales 27 x 72 [x parietibus validis ; 

 cuticula levis. Amphigasiria caulina foliis subsequalia, apice ad 

 1/7 emarginato-biloba, lobis obtusis, basi breviter inserta, optime 

 cordata, alis conniventibus. 



354 



