File:A text-book of mycology and plant pathology (1917) (14785244733).jpg

Identifier: textbookofmycol00hars (find matches)
Title: A text-book of mycology and plant pathology
Year: 1917 (1910s)
Authors: Harshberger, John W. (John William), 1869-1929
Subjects: Plant diseases Fungi
Publisher: Philadelphia : P. Blakiston's Son & Co.
Contributing Library: University of British Columbia Library
Digitizing Sponsor: University of British Columbia Library

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
ent of the hyphae in variousways has suggested the segregation of species and genera. The underlayer (subiculum = felted stratum of hyphae) is of loose, entangledthreads, or disc-like bodies, or radially stretching fibrils, aggregatedloosely. The stroma on the contrary represents compact tissue, cor-responding to similarly named structures in the ASCOMYCETALES.The fruit layer originates in or on the stroma. Reproduction is dependent on exogenously produced spores, knownas conidiospores. In the simplest cases, the mycelium gives rise atindefinite places to outgrowths, which are separated as spores. Therearise from the myceliun>, erect conidiophores which form conidiosporesin the different species. With an unbranched conidiophore, the conidio-spores arise at its apex followed by a second, a third, etc. When theend of the conidiophore is globular, the spores arise on the ends ofsterigma. By the branching of the conidiophores originate conidial 258 FUNGI IMPERFECTI (dEUTEROMYCETES) 259
Text Appearing After Image:
Fig. 102.—Phyllosticta pavia on horse-chestnut leaves. (Cold Spring Harbor, L.L, July 28, 1915.) 26o MYCOLOGY strands, which suggest the inflorescences of flowering plants. One canseparate these into monopodial, or sympodial forms. A bundle of coni-diophores is known as a coremium (KoprjfjLa = broom). If the conidio-phores are arranged side by side, they form a conidial layer, whicharises on the upper surface of a stroma. Such a conidial layer may befolded, or it may be chambered, the irregular chambered spaces beinglined with the conidial layer. Finally, the conidial layer may be in-closed in receptacles called pycnidium, which correspond to those ofthe Pyrenomycetiine^. The conidiospores are of different sizes,hence one can distinguish them as a micropycnidia and as macro-pycnidia, and the spores as micro- and macropycnospores. Stylosporesare those spores borne on a filament (aTv\os = sl column). This termis also superfluous. The number of fungi imperfecti surpasses theASCOMYCETAL

Note About Images