36 Thirty-fourth Annual Report of the 



Pers., Oospora Candida, Wallr., Oidium Wallrothii, Thum., Monilia 

 J ructige?ia, Sacc, Acrosporium fructigenum, Pers., and Oidium laxum, 

 Ehr. 



Sphseropsis malorum, Berk. Apple Splrseropsis. (Plate 4, figs. 16- 

 21.) It is not an uncommon thing to find apples in Autumn lying 

 under the trees of the orchard and discolored by an incipient decay. 

 Sometimes this discoloration is seen in them while yet hanging on the 

 trees. It is the work and earliest manifestation of the presence of a 

 fungus, distinct from those already noticed. It has the usual brown 

 hue of decay produced by the mycelium of some other apple-infesting 

 fungi, and it is not easy to say just what fungus is causing the decay 

 until the fertile condition of the parasite makes its appearance. In 

 this case the discoloration is soon followed by the appearance of nu- 

 merous minute black pimples or pustules. These are at first covered 

 by the thin epidermis, but soon this is ruptured and the black, some- 

 what conical protuberance beneath is revealed. This is the spore-case 

 of the fungus. In due time it contains a cluster of spores which are 

 generally about twice as long as broad, and which range from eight to 

 twelve ten-thousandths of an inch in length. They are at first pale 

 in color and supported on a short stem or pedicel, but when mature 

 they become black or blackish-brown, separate from their pedicels and 

 escape through a minute aperture at the apex of the spore-case. The 

 spores are not always developed a3 soon as the spore-cases appear. 

 Sometimes fertile spore-cases are found in Winter or even in the fol- 

 lowing Spring. The specific part of the name of this fungus, Sphcerop- 

 sis malorum, is derived from the Latin mala, a word meaning apples. 



The generic name is suggested by the resemblance these fungi have 

 to species of Sphaeria. There is another genus called Diplodia which 

 scarcely differs from Sphaeropsis in any respect except that its spores 

 are divided in the middle by a transverse septum. In some instances 

 this mark of distinction between the two genera fails, for both divided 

 and undivided spores may be found in the same spore-case. And even 

 both so-called genera are now regarded by excellent mycologists as mere 

 forms or states of more highly developed fungi. For other remarks- 

 concerning this fungus see Thirty-first Report, page 20. 



V (10 



' PLANTS MOUNTED. 



Not new to the Herbarium. 



Thalictrum diocium L. Proserpinaca palustris L. 



Actsea alba Bigel. Corrms circinata L'Her. 



Viola -Selkirkii Goldie. Dipsacus syl vestris Mill. 



Hypericum mutil am L. Aster dumosus L. 



Linum striatum Walt. A. ericoides L. 



Vitis riparia Mx. A. Tradescanti. L. 



Euonymus Americana L. Solidago altissima L. 



Trifolium repens L. S. gigantea Ait. 



Lespedeza reticulata Pers. Polymnia Canadensis. L. 



Desmondium rotundifolium. .. I). G. Hieracium venosum L. 



Ribes hirtellum Mx. Vaccinium Pennsylvanicum . . Lam. 



R. rotundifolium Mx. Gerardia tenuifolia Vahl. 



