A text-book of mycology and plant pathology . e fruitbodies are woody and perennial. The family is naturally divided intofour subfamilies, as follows: Merulioide^, Polyporoide^, Fistulin-oiDE^, Boletoide^. Each of these subfamilies includes fungi whichare important economically. Meruloide^.—This subfamily includes two genera of interestingfungi: Merulius and Mycodendron. MeruUus is represented by sixty- FLESHY AND WOODY FUNGI 225 three species of which M. lacrymans, the dry-rot fungus, is most impor-tant. This fungus is of world-wide distribution, where it attacksstructural wood work and timbe
A text-book of mycology and plant pathology . e fruitbodies are woody and perennial. The family is naturally divided intofour subfamilies, as follows: Merulioide^, Polyporoide^, Fistulin-oiDE^, Boletoide^. Each of these subfamilies includes fungi whichare important economically. Meruloide^.—This subfamily includes two genera of interestingfungi: Merulius and Mycodendron. MeruUus is represented by sixty- FLESHY AND WOODY FUNGI 225 three species of which M. lacrymans, the dry-rot fungus, is most impor-tant. This fungus is of world-wide distribution, where it attacksstructural wood work and timbers. It has been so long associated asa destructive agent with the structural wood work of men, that it wassupposed to be an entirely domesticated form and not known to existin the wild form. Recent investigations have shown that it occurs onliving trees, which when used for structural purposes furnish woodwhich is liable to destruction later on. The mycelium of Meruliuslacrymans (Fig. 88), usually gains access to dressed boards, joists, or. Fig. 88.—Immature fruiting stage of dry-rot fungus (Merulius lacryiuati-.^ de-veloping on the front of a board. {After Clinlon, G. P., Rep. Conn. Agric. ,Stat., pi. xxviii, 1906.) rafters by the germination of one of its spores at a point where the beammay be in contact with a damp wall. Its mycelium penetrates the woodand usually grows lengthwise at first, the water for its extension beingsupplied by larger more tube-like hyphae known as the conductive hyphie,which carry water to the extreme end of the mycelial growth. The pres-ence of the fungus results in a decay of the wood, which is reduced to abrown punky mass, that crumbles between the fingers. When the myce-lium comes to the surface of the wood, it forms a white felt-like coveringstudded with water drops, hence the specific name lacrymans referring 226 MYCOLOGY to the tear-like drops of water pressed out of the living hyphal mature sporophore is an amber-brown col
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