共查询到19条相似文献,搜索用时 109 毫秒
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本文报道了寄生于菊科植物大丁草(Leibnitzia anandria)上的盘梗霉的一个新种——大丁草盘梗霉(Bremia leibnitziae sp. nov.)。它的形态特征与小孢盘梗霉(B. microspora)较为接近,但根据新种的孢囊梗分枝次数较多,且有时不规则,孢子囊体积较小,卵孢子容易形成以及寄主的差别等特点,可以将它们区别开。 相似文献
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霉草科(Triuridaceae)-中国大陆分布新记录科 总被引:4,自引:1,他引:3
报道中国大陆霉草科(Triuridaceae)2种分布新记录,大柱霉草(Sciapila megastyla Fukuyama et Suzuki)和多枝霉草(Sciaphila ramosa Fukuyama et Suzuki)。 相似文献
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本文报道寄生于甘青微孔草(Microula pseudotrichocarpa W.T.Wang)和疏花微孔草[M.diffusa(Maxim.)Johnst.]上的霜霉属一新种——微孔草霜霉(Peronospora microulaeMeng et G.Y.Yin)。以汉文和拉丁文描述此新种的形态性状,并。附图 相似文献
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茎点霉和叶点霉两属的新种及国内新记录种 总被引:1,自引:0,他引:1
本文对采自东北地区的115份茎点霉(Phoma)和叶点霉(Phyllosticta)的标本进行分类研究,有新种2个和国内新记录种9个。新种是木瓜生叶点霉(Phyllosticta chaenomelesicola L.Yu et Bai)和草玉铃生叶点霉(Phyllosticta convallaricola L.Yu et Bai)。新种有拉丁文和汉文描述及图。对新记录种作了简要介绍。模式标本保存于沈阳农业大学植保系真菌标本室(HMSAU)。 相似文献
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在近期缅甸北部的植物考察中,一种菌类寄生植物矮生喜荫草(Sciaphila nana Blume)被发现和确认。矮生喜荫草代表缅甸被子植物一新记录科,霉草科植物。矮生喜荫草主要特征为花单性同株、雄花内轮花被片顶端具有柄的门把状物、花被片6、3个雄蕊、花药4室。 相似文献
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茎点霉和叶点霉两属的新种及国内新记录种 总被引:1,自引:0,他引:1
本文对采自东北地区的115份茎点霉和叶点霉的标本进行分类研究,有新种2个和国内新记录种9个。新种是木瓜生叶点霉和草玉铃生叶点霉。新种有拉丁文和汉文描述及国。对新记录种作了简要介绍。模式标本保存于沈阳农业大学植保系真菌标本。, 相似文献
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中国橡胶树疫霉种的研究 总被引:3,自引:0,他引:3
疫病是我国植胶区的主要病害。近年来,作者从云南西双版纳和广东海南岛的橡胶树和胶园土共分离出57株疫霉菌种。通过分类研究,共鉴定出4个种:恶疫霉 Phytophthoracactorum(Leb.& Cohn)Schroeter,辣椒疫霉 P.capsici Leoman,柑桔褐腐疫霉 P.citrophthora(Sm.& Sm.)Leonian,和棕榈疫霉 P.palmivora(Butl.)Butler。其中辣椒疫霉是首次在橡胶树上发现。我国橡胶树疫霉的种群结构与东南亚和南亚的有所不同,除棕榈疫霉外,其余3种在东南亚和南亚均未发现。而东南亚常见种:簇囊疫霉(P.botryosa)、橡胶疫霉(P.heveae)和蜜色疫霉(P.meadii),在我国却迄今尚未发现或有待证实。以前报道分离自胶园土壤中的芋疫霉(P.colocasiae),可能系柑桔褐腐疫霉之误。绝大多数分离物经配对培养均可产生性器官:辣椒疫霉的A~1交配型和A~2交配型大致相等;柑桔褐腐疫霉和棕榈疫霉的A~2交配型则明显多于A~1交配型。 相似文献
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以里氏木霉及米根霉单菌固态发酵为对象,考察不同混合发酵形式对里氏木霉与米根霉混合固态发酵产纤维素酶的影响。结果表明:同时接种里氏木霉与米根霉,试验考察的两菌种接种量比1∶1(以孢子个数计)及5∶1条件下,两菌未产生明显协同产酶作用。米根霉延时(24 h)接种且菌种量比5∶1以及米根霉延时(48 h)接种且菌种量比1∶1,2种发酵形式产酶情况类似,滤纸酶活(FPA)及羧甲基纤维素酶(CMCase)酶活相对米根霉单菌发酵有所提高,而β-葡萄糖苷酶(β-GA)酶活相对里氏木霉单菌固态发酵结束时分别增加4.66及4.40倍,可以发现两菌产生一定协同作用。在米根霉延时(48 h)接种且菌种量比5∶1的发酵形式下,FPA及CMCase在发酵第7天酶活分别达到44.04 IU/g、627.14 U/g(以1 g干曲计),分别是里氏木霉固态单菌发酵产酶达到稳定期时酶活的1.36和1.63倍,两菌产生了有效的协同作用。 相似文献
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本文报道在我国菊科植物上寄生的5种单轴霉。其中采自云南的辣子草(Galinsogaparviflora Cav.)上的云南单轴霉(Plasmopara yunnanensis sp.nov.)为一新种。豨莶单轴霉(Plasmopara siegesbeckiae comb.nov.)和蜡菊单轴霉(Plasmopara helichrysi comb.nov.)为二个新组合。对新种作了汉文及拉丁文描述,并附有形态图,还讨论了新种、新组合与近似种之间的区别。 相似文献
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A new species, Caesalpinia elliptifolia , is described from Guangdong, China. The species is related to C. magnifoliolata and C. crista , but can be easily distinguished by its subsymmetrical pod with a wide cuneate base, brown hairs on the lower surfaces of leaflets, pedicels of flowers and fruits, and axis of inflorescences. 相似文献
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广东及海南菝葜属植物拾零 总被引:1,自引:0,他引:1
林祁 《热带亚热带植物学报》2000,8(2):159-160
报道灰叶菝葜、短便菝葜和四翅菝葜在广东分布的新记录,缘毛菝葜在海南分布的新记录,将小刚毛菝葜作为缘毛菝葜的异名,暗色菝葜和折枝菝葜作为马甲菝葜的异名。 相似文献
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A new species of Ephedranthus from the Brazilian Atlantic Forest is described and illustrated, and a preliminary key to the species of Ephedranthus is presented. Ephedranthus dimerus is the only species of the genus from the Atlantic Forest region and the first species of the genus with dimerous flowers. It is similar to E. guianensis in having narrowly obovate to elliptic leaves with similar dimensions and a cuneate to acute base. Nevertheless, the two species can be distinguished from each other by the number of monocarps per fruit and by the length of the stipe. 相似文献
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通过检查藏南翠雀花Delphinium nortonii 的主模式标本,发现《中国植物志》、《西藏植物志》和《Flora of China》中对该种的鉴定和描述有误。该种的花的退化雄蕊黑褐色,属于翠雀亚属的密花翠雀花组subgen. Delphinastrum sect. Elatopsis, 而上述几种植物志中长1以来将其置于退化雄蕊为蓝色或蓝紫色的翠雀组sect. Delphinastrum中。这几种植物志中记载的D. nortonii 实际上代表一个新种,即李恒翠雀花D. lihengianum。 相似文献
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报道了豆科Leguminosae昆仑岩黄耆Hedysarum krassnovii B.Fedtsch.在中国的分布。昆仑岩黄耆与近缘种红花岩黄耆H.multijugum Maxim.形态易混淆,但以其小叶3-9×3-7mm;旗瓣倒卵形,顶端凹陷约2mm深;翼瓣狭披针形;龙骨瓣近半圆形或矩圆形;花萼二唇彤;荚果具1-2节荚等性状易于区分。另外,此二种的物候期、生境及地理分布亦有区别。 相似文献
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贵州杜鹃花属(杜鹃花科)一新种——荔波杜鹃 总被引:5,自引:0,他引:5
描述了贵州杜鹃花属(杜鹃花科)一新种———荔波杜鹃Rhododendron liboense Z.R.Chen&K.M.Lan。该种以花序顶生,花冠粉红色,宽钟状,子房密被白色腺毛,柱头头状而近似于凉山杜鹃R.huianum Fang,但叶片狭窄,宽1.6-2.8cm,花序轴长1-3cm,花7-9朵,花冠较大,直径约8cm,花萼短小,长仅1-2mm而不同。 相似文献
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The floral biology and pollination process of Glechoma longituba (Nakai) Kuprian, a clonal gynodioecious, perennial herb that is widely distributed in China was investigated in natural populations.
During visits to the flowers of G. longituba, the carpenter bee—Xylocopa sinensis mainly displayed nectar-robbing behavior with minimal pollination. Nectar robbing behavior began at the onset of flowering
and continued for about 3 weeks ending at about the middle of the flowering period. A total of 18.6% floral visits in this
period were by nectar robbers, with about 90% of the flowers in the study populations being subjected to two or two nectar-robbing
episodes. During controlled experiments, lower pollination efficiency was recorded for X. sinensis compared to legitimate pollinators. Pollination by the robber-like pollinator X. sinensis during the early-mid phase of the flowering season yielded seeds of 16.16%. Although nectar robbing by the carpenter bee
seemed to have a slight enhancing effect on seed set in G. longituba, this effect was effectively masked by the more pronounced detrimental effect of nectar robbing. Experiments indicated that
nectar robbing by the carpenter bee reduced seed production by more than 26%, largely owing to the consequent shortening of
the life span of robbed flowers. Furthermore, 10.43% of the ovules and 13.04% of the nectaries in the robbed flowers were damaged, thus causing a decrease
or entire loss of reproductive opportunity in the robbed flowers. In addition, a higher number of pollen grains remained on
the androecia of robbed flowers indicating that nectar robbing may have a lowering effect on male fitness in G. longituba. 相似文献