28>. Staurastrum spicatum \N . ;inil (i. S. Wksi in .Iduiii. lidl. X.WIII, i8q5, 

 p. 70; in Trans. Linn. Soc. Bol. ser. :>, \', iHi^G, p. 2\)^, l. i5, f. lîiî. ,S7. (/iiln'inii 

 EiciiL. and Gutw., i8ç)/| (non St. diibiiun W . \>est, 1890). 



Forma spinis ad an^idus superiores seniiri^lliihiriiiii lii('\i(iiilms cl spiiiis ad ant;ulos 

 iiit'eriores lonnioribiis. 



Long, sine S[)iii. 22 u., ciuii spin. :m) a; lai. sine spiti, ■>J.\ jj., cntn spiii. iVi-I^i jj. ; iat. 

 islliin. -j a. — AnliiKiuia ; n" .'i. 



•'S.'). Staurastrum tetracerum IIalfs. — Anlio(piia : n°* 3, 4 and 5. 



28'i. Staurastrum trihedrale Wolle, i883 ; Desin. U. S. i88/|, p. i23, l. [\o, fi^. 12, 

 i3 ; ciiar. emend. W. and G. S. West, in Trans. Linn. Soc. Bot. ser. 2, V, 1896, p. 610, 



t. iG, r. -'A). 



Ljn;;. !\- <j.; lut. 33 [x; lai. islliin. 12 \i.. 



AnlicMjuia: n" 5 (fréquent). Cundinamarca : n" 24. 



28."). Sphaerozosma granulatum Roy and Biss. — Anlioquia : 11"' i and 2. 



286. Onychonema filiforma (Eiireivb. ) Roy and lîiss. — Anlio(|nia : n" 5. 



287. Spondylosium tetragonum W. West in Joiirn. Linn. Soc. Bol. XXIX, 1892, 

 p. 1 1"), I. 19, f. 2. 



Forma paullo minor, cellulis leviter ang-ustioribus. Long. 7,5-8,5 [i.; lai, 7-7,2 [j.; 

 Iat. isthm. 6 ,u.; crass. 4,5-5 (j. (PI. XXIII, fig. 55). 



F'orma trigona; cellulis a vertice visis Iriangularibus, angulis rotundatis, lateribus 

 concavis. Long. 8-9 |j. ; lai. 6-8,3 jj. ; Iat. islhm. 5-5,7 f- (l^'- ^^H') fi»- 56-57). 



Cundinamarca: n» 2^ (both forms fréquent). 



Il would nppear ihat Spondijlosiiim Treubii Bernard (in Bull. Dép. de l'Agric. 

 Indes-Néerl. 1909, p. 21, l. i, f. 16) is only a form oï Sp. tetragonum. 



288. Spondylosium ossiculorum spec nov. 



S. parvum, fdis non torlis, sine vagina mucosa ; cellulœ circiter r Vs'P'o longius 

 quam latum, siibprofunde constrictum, sinu valde aperlo et semicirculari ; semicellulac 

 subeliiplic;c, apice laie convexo, série singulo punctorum (^ pororum) transmcdium 

 semicellula; uniuscujusque ; semicellula' a verlice visirc lateelliptica-, a lalere visa' depresso- 

 subcircuiares. 



Long. cell. i2-i3,5 [j.; lai. 9,5-10, 3 [j.; Iat. isthm. 5-5,5 p.;crass. 7-8;;. (PI.XXIlI,fig.54). 



Anlioquia: Laguna above Estrella near Medellin, Central Andes; allit. 25oo m. 

 N» 3 (fréquent). 



This is apparenlly a verv dislinct species. The single row of cons])icuous puncUe 

 across the middie of each semicell really represcnls a transverse row of large pores in 

 the cell-wall. 



289. Hyalotheca dissiliens (Sm.) Bréb. — Anlio(|uia: n"^ i, 2, 3, 4 a"d 5. Cundi- 

 namarca: n°*^ 22 and 24. 



Large spécimens of forma Irideniala occurred from n» 3, and the spécimens from 

 n" 5 werc ail verv small. 



