— I o I s 



li- Al-: 

 leaves 



llM'IlU'd > 



mil slom 



tut'(s c'onsistiii^- ol' IVom sevoii [o IwcUc lilaiinMils atlaclicd 



i]iialic nuicroplivles. 



TIk! lilaiiieiils aro rallier rijjid and 

 fairlv slraiglit, allliough t^ontly iin- 

 dulated from base lo apex, and tlie 

 base ol' eacli filaïueiil is a Utile 

 deciimi)eiil. 



Il slaiids nearesl to M. robusta 

 Setciiell and Gardner (Algie of 

 N. W. America, Univ. (;alir. Pui)l. 

 Bot. 1903, p. 194), froiii wliicli il 

 differs in ihe snialler tulïs ol' shorler 

 and narrower filaments, wliich are 

 wider al ihe base llian al llie apex. 

 Moreover, se far as could Ijc obser- 

 ved even ihe sheatlis of ihe oldesl 

 filaments were not lamellose. 



M. crassa miglit aiso be compa- 

 red with M. calolrichoicles Hansg., 

 a species in which the filaments are 

 much more densely aggregated and 

 the trichomes considerably narrowei'. 

 The latter are also altenuated at 



llic apiees and somctimes piliferous, a characler wliich at once dislinguishes il from 



M. crassa. 



Fig. 1. — Microchiete crassa sp. nov. 



a, tufl of filaments, x 40 ; b, bases of three filaments, X 500 ; 



c, apex of filamenl, xôOO. 



Tamily Scytonemacex. 



3o. Tolypothrix lanata Wartmann. — Cundinamarca : n" 28. 

 3i. Scytonema crispum (Ag.) Bornet. — Cundinamarca: n" 20. 



Tamily Stigonemacese. 



32. Hapalosiphon hibernicus W. and G. S. West. — Anlioquia : n" 4. Cundina- 

 marca : n" 24. 



33. Hapalosiphon intricatus ^^'. and G. S. West. — Cundinamarca : n" 24. 

 34- Stigonema ocellatum iDjllw.) Tiiuret. — Cundinamarca : n" 24- 



