210 



THK JOUKXAL OF I30TANT 



The conclusion at which one must arrive is tliat *S'. ahhreviata 

 (Cooke) and S. inter mixta (B. & Br.) are distinguished solely by 

 the arrangement of their perithecia (a difference which future obser- 

 vations may entirely remove), and that they probablv constitute one 

 species (^S. interinixta), occurring indiscriminately on Rosa and 

 Rubus, and having in addition, on Rubus, a var. abbreviata (Cooke). 



The fungus on Rosa damascena may then also be described as a 

 variety or form of S. intermixta. It w^ould be a negation of all the 

 rides of common sense to place it, where it technically belongs, in 

 Pleospora, ^CatJia?nfiia, for it does not resemble the species of that 

 section at all, while it does in every waj' recall to mind S. intermixta. 

 Saccardo's method of arrangement, though wonderfully useful and in 

 fact indispensable (without it chaos would have reigned in the 

 Sphairiaceie), must not be forced upon us in disregard of obvious 

 affinities. 



A description of the new form is appended : — 



SPHiEBULINA. INTEKMIXTA, f. TALDE-EYOLLTA. 



Perithecia sparsa, globosa, 200-250 /» diam., tecta, dein erumpentia 

 ac subsuperficialia, contextu crasso minute parench3'matico atro- 

 olivaceo, poro pertusa. Asci oblongo-clavati v. obovati, ampli, diu in 

 globum f ascieulatim juncti, 50-75 x 15-20 fx, apice rotundato, efoveo- 

 lato, brevissime pedicellati, aparaphysati. Sporidia tristicha, oblongo- 

 clavata, utrinque rotundata, juniora 1-septata, dein 3— 4-septata, ad 

 septa praesertim medium leviter constricta, postremo 5-7-septata, 

 tunc rarius uno vel rarissime duobus loculis septo longitudinali in- 

 structis, perf'ecte hyalina. 



Hab. in ramulis emortuis Rosce damascened, socia Hendersonia 

 Roscdy in Horto Botanico, Edgbaston, Birmingham, Maio, 1919. 



Sphaendina intermixta f. valde-evohita. 

 Asci and spores, X 600. 



