. Introduction to botany. Botany. FUNGI AXD FUNGOUS DISEASES OF PLAXTS 245 growths of the mildew. Another complex method of reproduc- tion results in forming a heavy-walled body, the ascocarp, so called because it is the body which contains the sacs and asco- spores (fig. 190). In late summer the ascocarps may, Avithout magnification, be seen as small black bodies upon the surface of hlac leaves. "SA'hen the aseocarp is broken, the sacs and spores are exposed. From the walls of the aseocarp peculiar arms extend, and iii the lilac mildew and some related mildews these have strikingly branc
. Introduction to botany. Botany. FUNGI AXD FUNGOUS DISEASES OF PLAXTS 245 growths of the mildew. Another complex method of reproduc- tion results in forming a heavy-walled body, the ascocarp, so called because it is the body which contains the sacs and asco- spores (fig. 190). In late summer the ascocarps may, Avithout magnification, be seen as small black bodies upon the surface of hlac leaves. "SA'hen the aseocarp is broken, the sacs and spores are exposed. From the walls of the aseocarp peculiar arms extend, and iii the lilac mildew and some related mildews these have strikingly branched tips. The heavy-walled aseocarp is resistant to unfavorable climatic conditions. It may pass through the winter and break open in the following sprmg, thus free- ing the thin-walled sacs. Upon escaping from the sacs the spores may be blown or carried about and germinate upon new host leaves. 233. Blue mold or green mold. When old shoes, gloves, or other articles made of leather are left in damp, warm places, a blue or green mold (J-'enieillmrif) fre- quently develops upon them. This mold also grows upon old lemons and oranges, and upon cheese. Various species have distinctive shades of color, so that the common names of blue mold or green Diold can be taken only as applying in a general way. Certain species of PenieUJuim are said to give characteristic flavors to the cheese in '^^â hich they grow, as PeniciUium Roqueforti of Roquefort cheese and PeniciUium Camemberti of Camembert cheese. These species are widely distributed and are found growing upon many substances besides cheese.^ PeniciUium. Fig. 191. The blue mold At the left is the tip of a hypha, with the character- istic branches, on the ends of which are the spores; at the right are germinating spores. Much magnified. After Thorn 1 An interesting discussion of various species and their cultural reactions is â â Cultural Studies of Species of PeniciUium,'' by Charles Thorn, , Mycologist in Cheese Investigatio
Size: 1262px × 1980px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublisher, booksubjectbotany
