Isotachis. khanz stepiiam. speciks iikpaticaiu m (Vol.VI, 1922) 



Hab. Africa oricnfalis : Rnanda (Mildbraed legit). 



53. Isoiachis eunistipiila Sl. n. sp. 



Sterilis niodiocris flaccida brunnoola, terricola profundo pulvi- 

 nata. Caulis ad 4 cm. longus, parum ramosus, tenuis, subarhizus. 

 Folia ccnilina romotiuscula, subrecte patula, conduplicatim concava, 

 in plano subrotunda(2,2 mm. longa, 2,4 mm. lata) apicem versus 

 leviter angustata, inferne paucis angulis obtusis armata, apice ad 

 1/5 inciso-biloba, sinu recto acuto, lobis late triangulatis porrectis 

 obtusiusculis. Ccllulce superse 27 \x, medise 36 \l basales 36 x 90 [x 

 trigonis majusculis, attenuatis, cuticula levis. Amphigasfria cau- 

 lina parva, caule vix duplo latiora, appressa, obcuneata, ambitu 

 subrotunda, apice profunde emarginato-bidentata, medio utrinque 

 unidentata, dentibus omnibus validis, triangulatis acutis, superis 

 porrectis, lateralibus oblique patulis. 



Hab. Africa orientalis : Lacus Kiwu (Mildbraed legit). 



54. Isotachis eeiiadorensis St. n. sp. 



Sterilis magna flaccida, fusco brunnea, in rupibus irroratis laxe 

 caespitans longeque prostrata. Caulis ad 6 cm. longus, simplex, 

 rarius furcatim ramosus. Folia caulina contigua, subrecte patula, 

 valde concava, marginibus incurvis, in plano late ovato-rotundata 

 (4 mm. longa, medio 3,5 mm. lata) margine supero irregulariter 

 denticulato, infero nudo, basi cordata, apice ad 1/3 bifida, rima 

 angusta obtusa, lobis anguste triangulatis, apice truncatis, quadri- 

 dentatis, ceterum nudis. Cellulx superse 36 x 36 (x trigonis magnis, 

 basales 27 x 12 ]x parietibus validis, cuticula verrucosa, basi strio- 

 lata. Amphigastria caulina minora (3 mm. longa et lata cordiformia, 

 basi utrinque leviter rotundata, apice obtuso ad 1/3 fisso, sinu 

 angustissimo nudo, lobis late triangulatis, marginibus ceterum 

 ubique (basi ipsa excepta) irregulariter denticulatis. 



Hab. Ecuador (Allioni legit). 



55. Isotachis flavicans. St. n. sp. 



Dioica mediocris, flavo-virens, flaccida, in terra calcarea pulvi- 

 natim csespitans. Folia caulina contigua, squarrose patula, condu- 

 plicatim concava, in plano subrotunda (3 mm. longa, medio 3 mm. 

 lata) brevi basi inserta, ad 1/3 emarginato-biloba, sinu amplo, lobis 

 late triangulatis subacutis. Cellulse superse 18 x 27 fx trigonis majus- 

 culis, leves, basales 18 x 54 (ji trigonis nullis, cuticula striolata. 

 Amphigastria caulina foliis sequimagna, simillima. Perianthia (juve- 



351 



