22 BRITISH CHAROPHYTA. 



I. Subinermis, papillis brevioribus parum conspicuis. 



1. Macroptila (vulgo longibracteata), foliolis sporangia longe 

 (duplo-sextuplo) superantibus, plerumque simul macro- 

 teles, foliorum articulis ecorticatis elongatis. 



(a) condensata, verticillis approximatis, dense implexis. 

 (H. 1. Ch. montana Schleich, CJi. coarctata Walbn.) 

 Capitato-condensata. 



(6) laxior, verticillorum foKis nunc divergentibus, rectis 

 vel arcuatim recurvis, nunc convergentibus. (Forma 

 vulgatissima, quasi centralis, Ch. divergens Koch et 

 Zis ; si munda : Ch. atrovirens Lowe.) 



(c) elongata, verticillis longe remotis, foliis foliolisque 



valde elongatis. (Ch. longibracteata Kiitz.) 



(d) stricta, verticillis remotis erectis, foliis foliolisque 



brevioribus. (Ch. funicularis Thmll. ex p., Ch. semi- 

 nuda Kiitz.) 



2. microptila (vulgo brevibracteata), foliolis sporangia parum 

 vel vix superantibus, plerumque simul , bracbyteles. 

 ArticuH foliorum corticati et fertiles plerumque numero- 

 siores. 



(a) contracta, verticillis approximatis, foliis arcuatoconni- 



ventibus. (Mimda : Ch. batrachosperma Thuill.) 

 (6) expansa vel subexpansa, magis elongata. (Ch. poly- 



sperma Kiitz. ; Ch. pleiospora Ganter. et munda : 



Ch. punctata Lebel.) 

 (c) clausa, brachypbylla (articulis paucioribus) submacro- 



teles, verticillis remotis arete conniventibus (Ch. 



squamosa Salle, non Desf.). 



II. Subhispida (Ch. vulg. papillata Walb.), papillis longioribus 



aculeiformibus, cauUs diametriim ssepe eequantibus, rarissime 

 superantibus. Cellularum corticis series secundarise pler- 

 umque valde prominentes. 



1. macroptila (et macroteles). 



(a) condensata. 



/ Capitato-condensata. 



(b) laxior, divergens vel connivens. (Ch. decipiens Desv., 



Ch. tuberculata Opiz). 



(c) elongata. (Ch. collabens Ag.) 



(d) stricta. (Ch. funicularis Thuill. ex p., Ch. stricta Kzg.) 



2. microptila (et brachyteles). 



(a) contracta. (b) subexpansa, expansa vel refracta. 

 (Ch. refracta Kiitz.) (c) clausa, brachyphylla. 

 j3. melanopyrena. Nucleus sporangii ater. 



