Identifier: origindevelopmen00kemp (find matches)
Title: The origin and development of the Pycnidium
Year: 1918 (1910s)
Authors: Kempton, F. E. (Forrest Ellwood), b. 1883
Subjects: Ascomycetes Theses
Publisher:
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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ma from grape. View, under high power, mycelialthreads with different stages of pycnidial development. Fig. 40. Beginning stage. Simple meristogenous• Figs. 41,42,43. Later stages. Fig. 44. Mature pycnidiura. Passr. Fig. 45. P. cichorii axi early stage in the development. Shortcells are formed which divide and branch. Fig. 46. An early stage in which there is much branching. Fig. 47. A medium stage in simple meristogenous development. Fig. 48. A typical compound meristogenous development. Macrophoma Fig. 49. M. citrulli ( B. & G.) Berl. & Vogl. Two celled stagein the origin of the pycnidium, from drop culture.Simple meristogenous development. Fig. 50. The same twelve hours later. Figs. 51, 52. Early stages of other pycnidia, from drop culture.Slight variation from simple meritogsnous type inthat many branches are involved. Figs. 53,54. Early stages in which much branching takes place.Drop culture. Fisrs. 55,56. Early stages from petri dish culture. Figs. 57,58. Later stages.
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40 Plate III. Fig. 59. IT. citrulli ( B. & C.) Berl. & Vogl. Symphogenous de-velopment in which branches from a number of mainstrands interweave. Fig. 60. A later stage in which a winding of the hyphae and oelldivision has taken place forming a pseudo-parenchymousmass • Sphaeronaema Figs. 61,62,63. B. firnbriatuui ( E. & H. ) Sacc. Early stages ofthe pycnidium in which a hypha coils, branches anddivides to form a knot-like mass. Sphaeropsis Fig. 64. S. malorum Pk. An early stage in the symphogenous de-velopment in which branches a,b,c, interweave near theirends to form a ball. Fig. 65. Interwoven hyphae in early sta^e of a symphogenous de-velopment. Fig. 66. A slightly later stage. Figs. 67,68. S. oitricola McAlp. Very early stages in the originof the simple meristogenous development of pycnidia. Figs. 69,70. Slightly later stages. Figs. 71,72,73,74. Later stages with short hyphae branching fromthe masses. Figs. 75,76,77. Unusual examples of developments in which moretha

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