PLATE IV. 



Fig. 



1. Ptilium crista-castrensis (Moss). A shoot showing 



sympodial growth due to a lateral branch continu- 

 ing the terminal growth of the main shoot after its 

 apex has been excised at v. (After Schoenau.) 

 p. 42. 



2. Blyttia Lyellii (Liverwort). A portion of the thallus- 



wing with adventitious snoots of various ages spring- 

 ing from the surface. (After Groebel.) p. 43. 



3. Lunularia vulgaris (Liverwort), a, a portion of the 



thallus with adventitious shoots springing from the 

 cut edge of the apical end ; b, shoots sprouting 

 from the stalk of the inflorescence ; c, a shoot sprout- 

 ing from the lower side of the disc. (After Vocht- 

 ing.) pp. 44 & 46. 



4. Mnium undulatum (Moss) . A plant, laid horizontally 



on the moist ground, giving rise to vertical lateral 

 branches. (After Schoenau.) p. 42. 



5. Orthotrichum Lyellii (Moss). A protonema changing 



into a rhizoid (r). (After Schimper, in part.) p. 50. 



6. Preissia quadrata (Liverwort), a, a fasciated arche- 



goniophore ; b, normal archegoniophore. (After 

 Coker.) p. 54. 



7. Buxbaumia viridis (Moss). A double capsule with 



two distinct setae springing from a single " vaginula." 

 (After Gyorrfy.) p. 59. 



8. Bryum argenteum (Moss). A double capsule caused 



by an insect-bite at the apex during the young 

 stage. (After Monkemeyer.) p. 59. 



9. Marchantia polymorpha (Liverwort). Three rhizoids 



growing one within the other ; the innermost tertiary 

 one is in a young stage. (After Kny.) p. 50. 



