Lachnella 241 



Velutaria Fuckel e. p.)" and treated DasyscypJia, Trichopeziza 

 and Ilyalopeziza as subgenera. In 1889 he used the genus 

 Lachnella in a more restricted sense keeping it for those forms 

 with fihform paraphyses. Those species with what he calls 

 fusoid paraphyses, which is apparently another name for acerose 

 are placed in two different genera Trichopeziza Fuckel (1849) 

 with subsessile apothecia and Dasycypha with stipitate apothecia. 

 Whether the form of the paraphyses is a good character on which 

 to base a genus is a question. The presence or absence of a stem 

 is scarcely more reliable here than in Helofium and Phialea. 

 This is so variable in a given species that it is not regarded by us 

 as a sound character on which to found a genus. 



In 1897, Lindau, (Engler & Prantl, Nat. Pfl. V: 201. 1897.) 

 also took up the genus Lachnum Retz (1770) treating Trichopeziza 

 Fuckel (1849) as a synonym. If these two genera are synonyms, 

 Trichopeziza would have priority as a post-Friesian genus. 

 Lachnum {Trichopeziza) is distinguished by Lindau from Lach- 

 nella and Dasyscypha by its lanceolate paraphyses. 



In 1931, Clements and Shear (Genera Fungi 327) used 

 Lachnella with the Peziza flanimea Alb. & Schw. as the type 

 placing it in the Helotiaceae which belong to the inoperculates 

 and ignoring the fact that it had been made the type of the genus 

 Perrotia founded by Boudier and placed in the operculates. 



It will be seen from the above that no two authors have had 

 exactly the same conception of this genus resulting in almost 

 hopeless confusion. The writer is not presumptuous enough to 

 think that he can straighten out this hopeless tangle, but he can 

 at least present his own views. For the time being we are 

 inclined to use Lachnella in much the same sense used by early 

 workers, and include a number of the recent segregates. 



Hairs hyaline, appearing white, or cinereous. 

 On coniderous plant tissues. 



Spores ellipsoid to fusoid, not over 20 ^ long. 

 On species of Larix. 



Spores 6-8 X 15-20 /x. 

 Spores 4-7 X 10-18 /x- 

 Not restricted to Larix. 

 Spores 14-20 yu long. 

 Spores 11-15 /x long. 

 Spores usually less than 1 1 /x long. 

 On Pseudotsuga taxifolia. 



Forming cankers on branches. 

 Not forming cankers. 



