Nature and development of plants . Fig. 150. Fig. 149. A common black fungus, Hypoxylon: A, habit of the fungusas it appears on dead branches and logs. The round black bodies are anassociation of the mycelium, stroma, and numerous ascocarps. B, a singleascus enlarged, showing character of the ascospores. Fig. 150. The black knot, Ploivrightia, infecting a branch of cherry. Atthe bottom of the branch is shown the early summer or spore-bearingstage, c, and above a black warty mass of ascocarps, as, produced theprevious season. Fig. 151. A, several ascocarps enlarged, taken from region c in
Nature and development of plants . Fig. 150. Fig. 149. A common black fungus, Hypoxylon: A, habit of the fungusas it appears on dead branches and logs. The round black bodies are anassociation of the mycelium, stroma, and numerous ascocarps. B, a singleascus enlarged, showing character of the ascospores. Fig. 150. The black knot, Ploivrightia, infecting a branch of cherry. Atthe bottom of the branch is shown the early summer or spore-bearingstage, c, and above a black warty mass of ascocarps, as, produced theprevious season. Fig. 151. A, several ascocarps enlarged, taken from region c in B, diagram of an ascocarp as seen in section, showing the asci andthe opening for the escape of the ascospores. can be examined without revealing the minute hard black asco-carps (Figs. 149; 152, A). Many of these fungi are quite con-spicuous since the ascocarps are found in large compact massesand also because they are often associated with a more or lessconspicuous outgrowth from the mycelium called the stroma(Figs. 150; 152
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