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either large or not well-defined. Stem not plumiform, often 

 irregularly divided. Dioecious or r. monoecious. 

 Vni. Cupressina. Leaves not spreading when dry, mostly 

 small (in few ppecies large), not r. denticulate and circinnate, 

 not (exc. H. plicatile and H. crista castrensis) plicate; alar cells 

 gen. distinct r. large. Stem often pinnate. Sometimes monoe- 

 cious. 



a. Leaves (at least the elder of stem) yellow (r. red or 

 brown) at insertion, gen. small, in Imponentiformia somewhat 

 large. 



aa. Leaves recurved nearly to acumen, often circinnate. 



1. Plicalilia. Leaves plicate. Stem eradiculose often irre- 

 gularly divided; paraphyUia none. Capsule long narrow; pedicel 

 long. Dioecious very r. fruiting. 



2. Reptiliformia. Leaves not plicate. Stem us. creeping 

 and pinnate; paraphyUia r. (in jff. canariense) present. Capsule 

 not long; pedicel shortish. Monoecious us. fruiting. 



bb. Leaves not distinctly recurved and not plicate. Dioe- 

 cious or monoecious. 



3. Imponentiformia. Leaves somewhat large often circinnate. 

 Stem pinnate us. with paraphyUia. Habit of H. cupressi forme. 



4. Callichroidea. Leaves small circinnate. Stem often plu- 

 miform r. with paraphj'Uia. 



5. Raphidostegioidea. Leaves small not circinnate. Stem 

 not regularly pinnate; paraphyUia none. 



b. Leaves pale at insertion, often (priuc. in Cupressifor'miii)\iivge. 

 aa. Leaves circinnate. ParaphyUia sometimes numerous. 



6. MoHuscoidea. Leaves not recurved sometimes large. Stem 

 us. plumiform gen. not or sparingly radiculose. Dioecious. 



7. Haniulosa. Leaves small sometimes recurved. Stem not 

 plumiform, us. creeping; paraphyUia us. broad. Us. monoecious. 



bb. Leaves not circinnate. Stem not plumiform; paraphyUia 

 few or wanting. 



8. Cupressiformia. Leaves short-acuminate often large, some- 

 times recurved. Stem sometimes pinnate. Dioecious. 



9. Amblystegioidea. Leaves small long-acuminate not recur- 

 ved. Stem irregularly divided or subpinnate. Monoecious. 



1. Alaria C. Mueller mscr. 



A. Leaves distant decurrent, more denticulate at base; alar 

 cells large. 

 l.H.commutatam Hedwig. 



Leaves from broad-ovate base long-acuminate, gen. striate, 



