4 6 



_| 1_ Sporophydia solitary; nucleus 220-280 (-300) long. 

 ! Nucleus prominently 5-striate. 34. capitellata 



! ! Nucleus 6-striate ; striae scarcely prominent. 

 35. gracilis (Smith) Ag. 



2) Fruit in all divisions of the leaves except the first, 



which is usually sterile. 36. tenuissima (Desv. ) 

 Kiitz. 



3) Fruit only in the first division of the leaves. 



() Sporophydia single. 37. confervacea (Breb). 



A. Br. 

 OO Sporophydia 2-3. 38. pygmaea A. Br. 



4 ) Fruit only in the last division of the leaves; nucleus, 



265-285 long. 39. MulhnalcB Allen. 

 Glceocarpse. Fruit enveloped in mucus. 



1) Minute; diameter of stem, 170-250; nucleus, 230- 



300 long; striae, 6-7; Antheridium, 120-140 in 

 diameter. 40. batrachospermum ( Reich ). 

 A. Br. 



2) Minute; diam. of stem, 130; nucleus, 350 long; 



stride, 6; Antherid., 200 in diam. 41. minuta 

 Allen. 



3) Larger; diam. of stem, 300-450; nucleus, 300-360 



long; striae, 7-8; Antherid., 160-240 in diam. 

 Q) Leaves twice divided; shorter above. 42. leplo- 



soma Nordst. 



Q)Q) Leaves thrice-divided ; longer. 43. intermedia 

 Nordst. 



4) Diam. of stem, 400-750; nucleus, 280-360 long. 



! Leaves 2-3 divided. 



Qj. Fertile leaves contracted into a minute pedun- 

 culated head; striae on nucleus, 6-7 ; diam. 

 of Antheridium, 170. 44- Asagrayana 

 Scheff. (ined.) 



Qj. 0(j. Leaves gradually contracted into a head; ulti- 

 mate segments, 4-5; striae on nucleus, 6-7; 

 diam. Antherid., 200-230. 45. (pseudofla- 

 bellata), f. mucosa; (compare 33). 

 ! ! Leaves only twice-divided ; ultimate segments, 



large. 46. conformis Nordst. 



}"} Upper leaves, in part often four times divided, the ultimate 

 divisions (almost always sterile) forming a 2-4-cuspi- 



