^9oS] CURRENT LITERATURE 



2/7 



jragra 



of Notochlaena (Maraniae, squamosa, trichomanoides, vellaea, and lanuginosa) 



a lo induce apospory 

 N. Maraniae. which 



The 



apogamy, and apospory 



(/■ 



apospory 



£ 



apo 



fi' 



Last there is an 

 two apogamous 



7 



From the detailed account a few points of interest may be summarized as 



luuuwb. me prothaliia of Truhomanes Kraiissii consist of both filamentous apd 

 flattened parts; archegonia fail to develop; antheridia never attain maturity, 

 apogamous embryos develop from the filamentous part, or from the margin or 

 surface of the flattened part; at the outset the apogamous embiyo consists of 

 several cell layers which the author thinks to be homologous with the archegonio- 

 phore; from this structure a leaf process first appears, and then the stem apex 

 develops independently of the former; the appearance of the root is delayed. 

 Apospory is also induced in the same species by cultivating cuttings of leaves on 

 loam; often the aposporous tendency prevails so far that antheridia are formed 

 directly from the margin of the leaf. 



Ine three forms of Pellaea (flavens, nivea, and tenera) and two species of 

 -Notochlaena {Eckloniana and sinuata) are all apogamous. No archegonia ever 

 c evelop, and in N. sinuata no antheridia are ever formed. Generally speaking, 

 m these five forms the apogamous structure is formed first as a leaf on the under 

 surface of the sinus of the prothallium from the apical meristem. The stem apex 

 then appears quite independent of the leaf; either between the leaf and prothal- 

 lium or under the leaf; the root aooears later. 



n in darkness, there is induced an apogamous structure, 



at first appearing as a leaf. After continued cultivation in ( 



induced; from the arrested leaf grown under the sinus of the prothallium a new 



^F^ - J 1 1 1 A 



apospor} 



structures. 



and develops also apogamous 



apogamous 



possible to distinguish the boundaries 



flavcns there were found 



leaf buds on the arrested leaf grown under the sinus of the prothaliia. Apoga 

 mous structures also developed from the same prothallium. 



As a result of regeneration there appeared several interesting cases. When 

 cut fragments of the sinus region of prothaliia are put on the soil, further con- 

 tinuous development is checked, but new structures arise. From these structures 

 often prothaliia are formed again. The prothaliia aposporously produced 

 develop antheridia.— S. YAMAxorcm. 



