(4^7) 



which, from their morphologic characters, clearly belong in this 

 group. Some of these are known only in the telial phase, others 

 only in the aecial phase. The following is a list of these unattached 

 forms recognized in this paper: 



f G. Ellisii on Chamaecyparis ] 



Aecial phase J G. fraternum " . " 



f G. Harkne 

 G. transfo 

 G. hyalim 



5S- ^- 



Clues of Relationship 



For most of the above forms there are no definite clues of probable 

 relationships. Some of the telial and aecial phases may belong 

 together, or, on the other hand, the alternate phases of the forms 

 here listed may still be undetected. G. Ellisii has been thought 

 by some to be connected with G. transformans, but this has never 

 been demonstrated. The writer (Kern, 1910 1 ) has suggested that 

 G. Ellisii is more likely related to G. hyalinum. G. Harknes- 

 sianum is a very striking form from California. It is similar in 

 habit and external morphology to the aecia of G. inconspicuum, 

 and by analogical inference I would suggest that it is probably 

 related to an inconspicuous telial form occurring on the green 

 branches, not causing hypertrophy, and having teliospores with 

 carotiform pedicels. It is possible that G. Sorbi may turn out to 

 have the most interesting life-cycle of all, if it should be related 

 to Uredo nootkatensis on Chamaecyparis nootkatensis, as I have 

 previously suggested (Kern, 1910 1 ). For the two Japanese forms I 

 am unable to make any suggestions. 



In addition to the unattached aecial forms listed above, there 

 is another form from Japan, Aecidium Pourthiaeae Sydow, on a 

 malaceous host, Pourthiaea villosa, which doubtless has a cedar- 

 rust for an alternate stage and belongs in this group. In structure 

 and habit this form is so similar to the North American species, 

 G. Libocedri (Bias dale anum), which is connected with a telial 

 form on Heyderia decurrens (generally referred to as Libocedrus 

 decurrens) that it has been thought best to treat it as a doubtful 



