4 Fn-iCES. 



FAJIILY V. Sehiggcaeeae. Ring operculiform, crowning the appt , 



of the sporangium. Sporangia either 1 — 2, placed in the axils of imbricate, 

 clasping, scale-like indusia or numerous, but then placed in 2 — 4 re^ar, 

 naked rows. Diels, 1. c, fig. 192; Hk. Bk., 1. c, tab. VIII, fig. 64, tfli. IX, 

 fig. 68. / 



FAMILY VI. Poljpodiaceae. Ring incomplete, vesical, the ex- 

 tremities sometimes separated by the stalk of the sporangium only. Sori 

 definite or indefinite and then the sporangia densely crowds over the paren- 

 chyma; indusium wanting or present. (Ring sometinws as in Cyatheaceae, 

 hut then the indusium linear and the ferns not arf<orescent). Diels, 1. c, 

 fig. 57 & 87, D & H; Hk. Bk., 1. c, tab. I, fig. 1,/. 



FAMILY VII. Parkeriaceae. Riiur ^^ in Polypodiaceae, Sori 

 indefinite, consisting of many sporangia scattered irregularly along the few, 

 longitudinal veins, protected by the much oecurved margin of the frond when 

 young. Diels, 1. c, fig. 178—179; Hk. J^., 1. c, tab. Ill, fig. 32. 



FAMLY Yin. Osmundacc^e. Ring incomplete, short and hori- 

 zontal or consisting of a roundishylateral group of thickened cells. Indusium 

 wanting. Diels, 1. c, fig. 203yflk. Bk., 1. c, tab. VIII, fig. 62, c, & 63, b & d. 



h.h. SERIES/«. EXANNULATAE. Sporangia without/ring. 



FA5ULY IX. Hfuratiiaceae. Sori consisting of 8 — 24 sporangia. 

 Sporangia free, placed in 2 close, short rows or joined into 2-valved or cir- 

 cular synangia. HyL, 1. c, fig. 239 ; Hk. Bk., 1. c, tab, IX, fig. 69, 70 & 72. 



a.a. £LASS H. TUBEIMTHAI^LOS-AJB. Prothal- 

 /lium white, tuberous, hypogeous or immersed in the substratum. 



FAMJLY X. Ophioglossaceae. Sporangia without/ring, rather 

 large, iiot gathered into sori hut placed on much contracted, spicate or pani- 

 culaj/ segments originating from the base, the centre or the margin of the 

 baft-en, normal-shaped segment of the frond. Diels, 1. c, fig. 259, A — B & 

 J^O; Hk. Bk., 1. c, fig. 73 -75. 



