Chaetomium spinosum, sp. nov. Aureo-flavum. Peritheciis magnitudine mediis, subglobosis, 290224 μ (273-318 X 206-262), cirrhis instructis; pilis lateralibus numerosis rectis, rigidis, acutis, irregulariter et parum distincte septatis, basi atrobadiis, asperulis vestitis, apice hyalinis, levibus; pilis terminalibus rectis, rigidis, acutis, asperis vestitis, ramosis, ramis ramulisque dilute olivaceis; ascis clavatis, octosporis, 41 X 7.5 μ, p. sporif. 22 μ; sporidiis subdistichis, pallide olivaceis, oviformibus, 5.9 × 3.9 μ (5.6–6.4 × 3.2–4). μ Growing in cultures of dung from Buenos Ayres (R. Thaxter). This is, apparently, a rare species having appeared but once. The egg-shaped spores and the branched terminal hairs are peculiar to the species. From the dark, stiff, spine-like shafts or the terminal hairs arise slender, delicate, irregularly swollen and constricted branches, from which secondary branches arise. As the cirrhus of spores forms the branches rise in the form of a column and in this way a support is formed for the spore mass. Chaetomium ampullare, sp. nov. μ Ochraceum. Peritheciis majoribus, longissimis, 489 × 147 μ (456532 X 137-167), sporidiis irregulariter conglobatis gerentibus; pilis lateralibus paucis, gracilibus, regulariter et distincte septatis, basi rectis, olivaceo-fuscis, asperulis vestitis, apice collabentibus, levibus; pilis terminalibus longis, gracilibus, distincte et regulariter septatis, successive aureo-brunneis, aureo-flavis, hyalinis; levibus, ramosis, in fila hyalina elongatis; ascis clavatis, octosporis, 45 × 9.7 μ, p. sporif. 23 μ; sporidiis subdistichis, laete olivaceo-flavis, utrinque umbonatis, limoniiformibus, 8.1-8.9 X 6.4 μ. On culture of sail cloth from Lowell, Mass. On dung from North Carolina (R. Thaxter). The species is clearly characterized by the very much elongated bottle-shaped perithecium, and by the terminal hairs which are drawn out into long, hyaline, tangling, easily collapsing threads. Chaetomium aureum, sp. nov. Griseum, pallide-olivaceum, lutescens, demum aureo-flavum. Peritheciis minutis, globosis, 127 X 115 μ (110-140 X 105-123), cirrhis instructis, pilis lateralibus numerosis, tenuibus, rectis vel flexuosis, regulariter et distincte septatis, olivaceo-flavis, asperulis vestitis; pilis terminalibus olivaceo-flavis, regulariter septatis, asperulis vestitis, arcuatis, apice subrectis vel incurvatis; ascis clavatis, octosporis, 42 X 10 μ, p. sporif. 26 μ; sporidiis olivaceo-brunneis, irregulariter ovatis, utrinque apiculatis, 9.8 X 5.4 μ (9.4-11 X 4.7-5.6). On paper, dung and other materials of various kinds from New England. In cultures of old paper from Java (R. Thaxter). The small size and characteristic golden yellow color clearly distinguish this species from all others except Chaetomium trilaterale and Chaetomium fusiforme. From the former of these it differs in that the spores are discharged in long black cirrhi, in the comparative obscurity of the perithecial hairs at maturity, in the incurved tips of the terminal hairs, and in the irregular, oval shape of its spores. From the latter it differs also in producing long black cirrhi, in the incurved extremities of its terminal hairs, and in the size of its spores and their irregular oval shape. Chaetomium fusiforme, sp. nov. Griseum vel pallide olivaceum. Peritheciis minutis, subglobosis, 120 X 102 μ (116-123 × 101-125), cirrhis carentibus; pilis lateralibus numerosis, tenuibus, flexuosis, regulariter et distincte septatis, olivaceo-flavis, asperulis vestitus; pilis terminalibus crassioribus, asperulis vestitis, olivaceo-brunneis, regulariter et distincte septatis, arcuatis, apice circinantibus vel subconvolutis; ascis clavatis, octosporis, 48 X 11 μ, p. sporif. 32 μ; sporidiis laete olivaceo-flavis, vel olivaceo-brunneis, longis, angustis, subfusiformibus, apice rotundatis vel apiculatis, 15.8 X 5.4 μ (15-16 × 4.8-5). On paper from Alabama (Herb. R. Thaxter). The long narrow spores distinguish this form from all other species of Chaetomium. In general characteristics it most nearly resembles Chaetomium aureum and Chaetomium trilaterale, but differs from both in the long, slender, fusiform spores. Chaetomium trilaterale, sp. nov. Olivaceo-flavum. Peritheciis minutis, subglobosis, 106 X 94 μ (100-110 × 90-97), cirrhis carentibus; pilis lateralibus numerosis, gracilibus, longioribus, regulariter et distincte septatis, aureo-flavis, basi rectis, asperulis vestitis, apice 1-3 spiraliter convolutis, levibus; pilis terminalibus irregulariter septatis, olivaceo-brunneis, asperulis vestitis, arcuatis, apice 1-3 spiraliter convolutis; ascis clavatis, octosporis, 50 X 9.5 μ, p. sporif. 26 μ; sporidiis subdistichis, laete olivaceo-flavis, forma sphaerasectoris praeditis, utrinque subapiculatis, 9.5 X 5.5 μ (8.9-9.7 × 5.2-6). On paper from New England (Herb. R. Thaxter). This species has certain characteristics in common with Chaetomium aureum and Chaetomium fusiforme. From the former it differs in the more numerous, stout, 1-3 spirally convolute, terminal hairs; the spirally coiled lateral hairs; the smaller size and unusual shape of the spores. From the latter it differs in the convolute lateral hairs; the shape of its spores and their smaller size. Proceedings of the American Academy of Arts and Sciences VOL. XLVIII. No. 5.-AUGUST, 1912. A STUDY WITH THE ECHELON SPECTROSCOPE OF CERTAIN LINES IN THE SPECTRA OF THE ZINC ARC AND SPARK AT ATMOSPHERIC PRESSURE. BY NORTON A. KENT. WITH TWO PLATES. INVESTIGATIONS ON LIGHT AND HEAT MADE AND PUBLISHED WITH AID |