- loV, - 



Long. 2/1,5 (A ; lai. «iiiii |iiiic. 2,') u. ; lai. isllim. ;) a. [V\. -\.\1, fi;;-. 'M\). 



Antioqiiia : Bon' in'ar liic Lai^iina alioNc Mcilclliii, (".(Milral .\iiilcs ; allil. ■ï^o(^ m. 

 N" 5. 



Tliis varielv shouM be ooni|iare(l wilii Si. sn/ipo/i/niorp/iiini J3ou<;n, clcscribed from 

 Bz'azil in iC)o3. Il seeins scarcelv possililc lu ic^ard Houge's s|)ecics as ollicr lliaii a form 

 of Sf. (/is/c/ilu/ii. 



■j(3(i. Staurastrum gemelliparum \ohdst. luriiia iniiior. Long', ciiiii proc. 20 \). ; 

 lai. cum |iii)c. 18 <j.. — Aiilioquia : u'" 1 aiul ■>. 



267. Staurastrum gyratum \V. and (i. S. >\ i:si in Ann. Uoy. Hulan. (lard. Calciilta, 

 VI, 1907, p. 219, t. lô, f. 27. 



Var. divergeas var. nov. 



Var. coi'|)ori' soinici'llularuin paiilhi nuNni-L' ; pi'dcossiliiis \-aliiiii)riliiis cl (."l'a.ssiuribu.s. 

 Liiny. sine prdc. Su., cum |iror. 18-19 |a; l;il. siiu; proc. ricc. 7,r)-8 [x, cum proc. 

 23-26 (A ; ial. islhm. '1 a. (Pi. XXI, liy. .'.(i). 



Candinamarca : Lai;uua de Ubaquc, Ea.sleiii Andes ; allil. 2(i(36 m. N" 23. 



268. Staurastrum hirsutum (EiiuKMi.) BuÉn — Cundiiiamarca : u" 24. 



269. Staurastrum illusum spec nov. 



St. minulum, [)aullo lalius (juaai iongum, prut'undissimc conslriclum, siiiu acutan- 

 gulo et leviler aperlo ; semiceliula; Iransverse clliptico-oblonga\ dorso convexiori quam 

 veiilro, angulis laleralibus laie rolundalis ; a verlice visa^ triangulares, angulis rolunda- 

 lis, laleribus valde concavis ; membrana lenuissima cl punctata. 



Long. i9-2(j ]}. ; ial. 21 u. ; lai. isthm. 5-6 \i.. (Pi. XXI, fig. 26). 



Anlioquia : Laguna aiiove Eslreila near Mcdclliu, ('.cuirai Andes ; aitit. 25oo m. 



No 3 (abundanl). 



Il is only after carefui deliberalion ihat I venture lo describe tliis Desmid as a new 

 species. Ils allies are St. mnticani Brkb. and St. lanceolatiini Akcii., but ihere is lillle 

 doubl ihal il would be quile wrong lo refer il lo eilher of lliose s])ecies. Il is much 

 more délicate than St. miiticum, vvitli more depressed semiceils, witli narrower angles 

 in the vertical view, and a very distinctly |)unctale cell-vvall. From St. lanceolaliim var. 

 compressiini it dilTers in ihe rounded lalcral angles of llic scmicclls, in tlir more concave 

 sides of ihe vertical view, and in llie ()unctale cell-wall. 



270. Staurastrum inconspicuum Nordst. — (amdinamarca : n" :>![. 



271. Staurastrum leptocladum ^ouDST. forma africanum G. S. \\ est in .lourn. 

 Linn. Soc. Bol. XXXVIII, 1907, p. 129, t. G, f. 12. 



Seniicellube a verlice visa' corpore rliomboides-roluiidalo. Long. /|0-42 |a ; lai. sine 

 proc. cire. 20-21 ^., cum proc. i36-i48 jy.; Ial. bas. semicell. 10-10, 5 [j. ; lat. isllim. 7 [j.; 

 crass. 17 y.. — Cundinamarca: n" 23. 



E.vcept for the rhomboidal sha])e of tlic body oi' llie semiceils as seen in vertical view 

 the spécimens were identical in ail respects willi lliose originally described from Nyasa 

 and Victoria Nyanza. 



