Notes and brief articles Table 2. Effect of temperature on decay of swede tissue blocks soaked in 10000 ppm solution of streptomycin for 10 min before inoculation with Botrytis cinerea No. days after inoculation 3 6 10 20 4±0'9 7±0'2 5±0'2 7±0'0 5±0-2 7±0-0 3±0-7 6±0-5 20° Water-treated Streptomycin-treated 4° Water-treated o z oc o j o-o 2±1'2 Streptomycin-treated 0 ± 0'0 0 ± 0'0 3 ± 1'2 * Degree of decay (mean of four replicates). TWO NEW SPECIES OF AERO-AQUATIC HYPHOMYCETE Specimen examined. Bystock Reservoir, Devon, England, in submerged needles of Pinus sylvestris, Sept. 1975, J. Fisher, Holotypus, University of Exeter. Herbarium No. 3570 (lMl 229630). In all other known members of the genus the number of gyres per spore exceeds two and the spore chains are more vertical than horizontal. The fungus was first found in September 1975 growing abundantly in submerged needles of Pinus sylvestris recovered from Bystock Reservoir, South Devon (Map Ref. SY 034843). Pine leaf litter was collected and incubated for 14 days on moist filter paper in Petri dishes at 10 0 after which conidia were seen. The fungus readily colonizes autoc1aved pine and beech leaf litter (Pinus sylvestris) and (Fagus sylvatica) in aerated distilled water after inoculation with a homogenized MA disk of an 8-week-old culture. Subsequent moist chamber incubation on filter paper in Petri dishes at 15" leads to abundant sporulation on the leaf surfaces. The fungus also colonizes freshly abscissed, and to a lesser extent, green needles of Pinus syloestris in the field. Pine needles, of both kinds were sewn into nylon bags 1 mm mesh, and submerged in Bystock Reservoir for 18 months. On recovery the needles appeared to be near to disintegration. Subsequent moist chamber incuba- tion as previously described led to abundant Colony growth rate on 2 % MA 8 mm diam in Z weeks at 15°, white at first, turning olivaceous, reverse of ageing cultures fuscous black, hyphae branched, septate, up to 2 pss: diam. Conidiophore: branched, thin-walled, hyaline, cells moniliform, zoo x 2'5 psx». Conidia blastic, apical, solitary, hyaline, snow white in mass, 7-11 I,m diarn, coiled in a single three dimensional helix, cells S. K. ABDULLAH, P. J. FISHER AND J. WEBSTER Department of Biological Sciences, University of Exeter Linder (1929) listed five species in Helicodendron 2-4, moniliform. Conidia acropetal mostly in Peyron. as follows: H. fuscum (Berk. & Curt.) horizontal chains of up to 20, readily deciduous. Linder, H. hyalinum Linder, H.paradoxum Peyron., Propagules occasionally straight or slightly curved H. triglitziense (Iaap) Linder and H. tubulosum showing 1 or 2 terminal scars, up to 25 pm long. (Riess) Linder. Glen-Bott (1951, 1955) described the following new species in the genus: H. articulatum, H. conglomera tum, H. giganteum and H. luteo-album, Van Beverwijk (1953) described two further species, H. multicatenulatum and H. westerdijkiae. Helicodendron fractum Fisher sp.nov. (Figs. 1-Z). Colonia crescens in 2 % MA 8 mm diametro per duas hebdomades temperatura 15c, alba primo divacescens, fusca et nigra sub culturis senescentibus, Hyphae ramosae septatae ad 2 I,m diam. Conidiophora ramosa muris perexiquis, hyalina, cellulae moniliformes 200 x 2'5 p,m. Blastosporae apicales solae incoloratae albae in cumulo, 7-11 I,m diarn, convolutae in una he1ice per tres dimensiones, cellulae moniliformes. Conidia acropetala plerumque in catellis horizontalibus ad 20, facile decidua. Propagula aliquando recta a modice curvata dernonstrantia cicatrices terminales, ad 25 I,m per longitudinern. Trans. Br, mycol. Soc. 72 (2), (1979). Printed in Great Britain 0007-1536/79/2828-5050 500.35 .. <;. 1979. The British Mycological Society