100 



PIATE IX. 



Fig. 38. Young \)voiha\\\um of Glcichenin 

 pohjpodioulcs Sm., seen from below, 

 22X'i <^i antheridiii; ?, arcliegonia. 



Fig. 29. Lower surface of young prothal- 

 liuni of G. dicholoma Willd. 22 X- 



Fig. 40. Lower sui'face of young pro- 

 tlmllium of (7. pcclinata, Presl., 22 X- 



Figs. 41 — 42. Two larger prothallia of 

 G. polypodioidcs, 5 X ; F'g- -42 is seen 

 from below and shows an embryo, em. 



Fig. 43. An older prothalliura oi G. pec- 

 I'uiala^ upper suri'ace, 4 X- 



Figs. 44 — 45. Two prothallia of G. pec- 

 tinata, seen from below, 4X; Fig. 45 

 shows two groups of arcliegonia, pro- 



bably resulting from a dichotomy of 



the growing point. 

 Fig. 46. Prothallium of G, laevigata 



Hook. 3 X- 

 Figs. 47 — 49. Three large prothallia of 



Cr. dic/wloma, 5X; Fig- 48 is seen 



from below and shows the position 



of the numerous arcliegonia, Q. 

 Fig. 50. Prothallium and young sporo- 



phyte of G. peclinata, 4 X- 

 Figs. 61 — 52. Prothallia with young 



sporophytes, sp, oi G. dichotoma,by(,. 

 Fig. 53. Prothallium and young sporo- 



phyte of G. laevigata, 5 X« 



PLATE X. 



Fig. 54. rrothallium of (V. dicJiotoma, 

 with the young sporophyte; a, from 

 above; b, from below, 5X' 



Fig. 55. Prothallium of the same species 

 with somewhat older sporophyte, 5 X- 



Figs. 56 — 58. Young sporophytes of G. 

 dicholoma still attached to the pro- 

 thallium, showing the development 

 of the cotyledon, 5 X- 



Fig. 59, Transverse section of the pro- 

 thallium of G. laevigata, showing 

 the position of the antheridia, </, and 

 archegonia, 9, 25 X- 



Fig. 60. Horizontal section of the prothal- 

 lium-apex in G. laevigata, 275 X; ^"i 

 apical cell. 



Fig. 61. Another section of the same apex, 

 showing the youngest "leaf, L; 275 X- 



Fig. 62. Young sporophyte of G. pectinala 

 with four leaves, 2X; the fourth leaf 

 already bears perfect sporangia, ,sp. 



Fig. 63. Cell from the prothallium of 

 G. pectinala, showing the endophytic 

 fungus, 480 X; n, nucleus of the pro- 

 thallium cell; m, degenerating chro- 

 matophores(?). 



Figs. 64—69. Development of the an- 

 theridium of G.pcc/i>?a<o, seen in lon- 

 gitudinal section; 1 and 3 in Figs. 

 68 and 09 are the outer sections; 2, 

 the median section; Figs. 04— 00 and 

 08, 480 X; Figs. 07, 69, 275 X- 



PLATE XL 



Fig. 70. Two transverse sections of a young 

 antheridium of G. pcclinata, 480 X- 



Fig. 71. Three transverse sections of a 

 young antheridium of G. pectinala, 

 275 X; "1, apical section; 2, nearly 

 median section; 3, basal section. 



Fig. 72. Nearly median longitudinal 

 section of a full-grown antheridium 

 of G. pcclinata, 275 X- 



Fig. 73. Transverse section of a simiLar 

 aiitheriilium. 



Fig. 74. Two apical views of antheridia 

 of G. pcclinata, showing the oper- 

 cular-cell, o, 275 X- 



Fig. 75. Fully developed si»erm-cells of 

 G. pectinala, 950 X- 



Pig. 76. Transverse section of very young 

 antheridium oUi. polypodioidcs, 050X- 



Fig. 77. Two transverse sections of an 

 older antheiidium of the same species, 

 480 X- 



Fig. 78, 1, median; 2, outer section of 

 a nearly ripe antheridium of G. poly- 

 podioidcs, 275 X- 



Fig. 79. Three sections of a recently 

 opened antheridium of the same spe- 

 cies; in 3 is shown the destroyed 

 opercular cell, a; 275 X- 



