Julian H. Miller

Biologic Studies in the Sphaeriales—II

The fungi which constitute the object of this investigation are included in the Sphaeriales by Lindau (16). This order, together with the Perisporiales, Hypocreales, Dothideales, and Laboulbeniales, compose the Pyrenomycetes, an enormous assemblage of forms distinguished by the type of ascal conceptacle which is called the perithecium. The orders of the Pyrenomycetes are separated by most mycologists in the following manner. The Perisporiales comprise forms in which the perithecia remain closed or have an atypical opening. The Hypocreales have fleshy, bright-colored or colorless perithecia which, though sometimes brown, are never black and hard. In the Dothideales the asci are formed in locules in a

Studies in the Development of two Myriangium Species and the Systematic Position of the Order Myriangiales

The characters of Myriangium Duriaei and M. Curtisii have been studied in serial sections. The fertile disc in the former arises from one archicarp, and consists of asci and ascogenous hyphae; whil...

Study of Bagnisiopsis Species on the Melastomaceae

This is a group of interesting fungi occurring on living leaves of various genera and species of the Melastomaceae in tropical America. In the revision of the genus by Petrak (5) species parasitizing this family are placed in the section Eu-bagnisiopsis, and this paper is confined to a study of that section. Many published descriptions are to be found rather widely scattered throughout the literature. It has been the purpose of this investigation to bring these together with a key and descriptions. Several names have been reduced to synonymy, and one new description added. Most of the specimens studied have been collections of Drs. C. E. Chardon, A. S. Muller, R. A. Toro, and Prof. H. H. Whetzel, gathered in many mycological explorations in Central and South America and the West Indies. In addition to these the writers have been most fortunate in being able to see those in the Theissen herbarium at Harvard University. The writers wish to acknowledge their appreciation for the loan of specimens to Dr. D. H. Linder, Farlow Herbarium, Harvard University, Dr. F. J. Seaver, New York Botanical Garden, Mr. J. A. Stevenson, U. S. D. A. Mycological Collections, Prof. H. H. Whetzel, Cornell University, and to Dr. C. E. Chardon for specimens from his private herbarium.

Georgia Pyrenomycetes I

This fungus consists of a flat, irregular thin black stroma, with projecting perithecia, growing over rough bark of oak. The ascospores are brown and elliptical, typical of the Xylariaceae. The position in Anithostoma, as in Ellis & Everhart (1. c.), is untenable as the concept of the latter consists of perithecia pustulate or effused, sunken in the matrix within a valsoid or eutypoid stroma; and a superficial or erumpent stroma entirely of fungous tissue as in the above fungus falls within Hypoxylon. On Quercus sp., Clarke and Rabun Counties.

Some New Species of Hypoxylon

The descriptions of the following new species of Hypoxylon are based on specimens sent the writer by Dr. Roland Thaxter and Prof. A. S. Muller, and others of his own collecting. The forms which are given varietal names do not differ from the established species in sufficient characters to warrant specific rank. In most cases they are distinct only in ascospore dimen? sions. This latter character varies considerably with material of different ages, but there is a fairly definite maximum limit. For example, Hypoxylon serpens Pers. ex Fries has ascospores which vary in length from 10 to 15 /x. This species was described from Europe and all material examined there falls within these limits. In America, however, the European form is very com? mon, but occasionally one finds what is apparently the same thing except for the much larger ascospores; that is, between 15 and 20 ix, in length. These variants may be mutants or hybrids, but in view of the present lack of knowledge of inheritance in the fungi, it seems best to give them varietal rank.

A new species of Elsinoe on southern Magnolia.

Elsinoe magnoliae sp. nov. Figs. 1-5. Sphaceloma magnoliae Jenkins & Miller, Jour. Wash. Acad. Sci. 42: 323, f. 1, 1952. Maculae epiphyllae, sparsae vel aggregatae et coalescentes, saepe per nervum contractae vel areas laminae marginales vel apicicales involventes, circulares vel angulares, subelevatae, albae usque griseae, brunneo-marginatae, usque 1.5 mm in diam., stromata ascogena vel conidifera in massis atris papillosis vel applanatis, solitariis vel dispersis gerentes; ascomata subcuticularia vel intraeidermicalia, superficie superiori denudata, subspherica usque applanata, 30-240/* in diam., 20-40/* crassa, ex parte inferiori et inter ascos e cellulis minutis hyalinis parenchymaticis, supra e strato cellulorum fuscorum crassitunicatorum epithecium 10-15/* crassum efncienti composita; asci numerosi in stratis 1-2 irregulariter dispersi, globosi usque late elliptici, sessiles, tunica interiori praecique ad apicem incrassata, 17.5-30 X 14-20 /*; ascosporae irregulariter dispositae, clavato-ellipoideae, 3-septatae, interdum longitudinaliter divisae, 9-14X3.5-6/*; stromata conidifera sporodochioidea vel acervularia: sporodochia e stromate pallido pseudoparenchymatico subcuticulari oriunda; conidiophora e cellulis fuscis crasso-tunicatis in superficie stromatis oriunda, divergentia, recta vel geniculata, usque 4-septata, fusca, ad apices pallidioria, 20-45 X 4-5 /*; conidia acrogena, apiculis brevibus producta, unicellularia, ellipsoidea, hyalina, 6-12 X 3-5 /*; acervuli intraepidermicali-

A Leaf-Spot Disease of Honey Locust Caused by a New Species of Linospora

The conidial stage of a fungus of common occurrence on the foliage of honey locust has been known as Melasmia hypophylla. Its fructification is an acervulus and not a pycnidium, and it belongs in t...