Mr. W. H. Lang. On Apogamy and the 



Name. 



Aspidium aculeatum, Sw., var. 

 multifidum. 



Aspidium angular e, Willd., var. 

 foliosum multifidum. 



Tar. acutifolium multifidum. 



Athyrium niponicum, Mett., nor- 

 mal form. 



var. cristatum. 



AtJiyrium Filix-foemina, Bernh. 

 var. percristatum. 

 var. cruciatum cristatum. 

 var. coronatum. 



Polypodium vulgare, L., var. 

 grandiceps. 



Aspidium frondosum, Lowe (from 

 the Pits, Royal Gardens, Kew). 



Result. 



Gametophytic budding. 



Development of archegonial projections. 



Apogamy. j Tl ' acheides in prothallus. 

 I Vegetative buds (rare). 



G-ametophytic budding. 



Development of archegonial projections. 



Apogamv / Bamenta on Prothallus. 



L Vegetative buds (frequent). 

 G-ametophytic budding. 

 Development of archegonial projections. 

 No apogamy seen. 



Gametophytic budding. 



Development of archegonial projections. 



Apoeam -f Trac ^ e ^ es in prothalloid growths 



I from archegonial projections. 

 Similar to the normal form, but in addition a 

 few apogamously produced vegetative buds. 



Gametophytic budding. 

 Development of archegonial projections. 

 Development of cylindrical process from apex 

 or from under surface of the prothallus. 



r Tracheides in process. 

 Apogamy. < Continuation of process as a leaf. 



L Vegetative buds. 



Gametophytic budding. 



A o am [ * 8 l ated leaf -like growths. 



L Vegetative buds (numerous). 



Apogamy. Vegetative buds produced on 

 short cylindrical processes before the cul- 

 ture had been watered. 



After the culture was watered, normal em- 

 bryos. 



In addition to the species mentioned in the table above, cultures 

 were made of crested and uncrested forms of Neplirodium Filix-mas, 

 Rich., representing the three sub-species, which are sometimes 

 distinguished in this country. Some of these (both crested and 

 normal) behaved in a similar manner to the species referred to in 

 the table, though only one instance of apogamy induced by long 

 cultivation has as yet been found. Others (crested and normal 

 forms) produced a single bud on the under side of the prothallus 

 which, did not bear archegonia. 



Connecting this latter type of apogamy, which agrees with the 

 description of l)e Bary and Kny, with the more normal prothalli, was 

 one variety, the archegonia of which developed into typical arche- 



