Representatives of the closely related genera, Interfilum and Klebsormidium, are characterized by unicells, dyads or packets in Interfilum and contrasting uniseriate filaments in Klebsormidium. According to the literature, these distinct thallus forms originate by different types of cell division, sporulation (cytogony) versus vegetative cell division (cytotomy), but investigations of their morphology and ultrastructure show a high degree of similarity. Cell walls of both genera are characterized by triangular spaces between cell walls of neighbouring cells and the parental wall or central space among the walls of a cell packet, exfoliations and projections of the parental wall and cap-like and H-like fragments of the cell wall. In both genera, each cell has its individual cell wall and it also has part of the common parental wall or its remnants. Therefore, vegetative cells of Interfilum and Klebsormidium probably divide by the same type of cell division (sporulation-like). Various strains representing different species of the two genera are characterized by differences in cell wall ultrastructure, particularly the level of preservation, rupture or gelatinization of the parental wall surrounding the daughter cells. The differing morphologies of representatives of various lineages result from features of the parental wall during cell separation and detachment. Cell division in three planes (usual in Interfilum and a rare event in Klebsormidium) takes place in spherical or short cylindrical cells, with the chloroplast positioned perpendicularly or obliquely to the filament (dyad) axis. The morphological differences are mainly a consequence of differing fates of the parental wall after cell division and detachment. The development of different morphologies within the two genera mostly depends on characters such as the shape of cells, texture of cell walls, mechanical interactions between cells and the influence of environmental conditions.

中文翻译：

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Interfilum and Klebsormidium (Klebsormidiales, Streptophyta) 的形态和超微结构，特别涉及细胞分裂和菌体形成

密切相关的属 Interfilum 和 Klebsormidium 的代表以 Interfilum 中的单细胞、二元或小包和 Klebsormidium 中的对比单列细丝为特征。根据文献，这些不同的菌体形式起源于不同类型的细胞分裂、孢子形成（细胞分裂）与营养细胞分裂（细胞切开术），但对其形态和超微结构的研究显示出高度的相似性。两个属的细胞壁的特征在于相邻细胞的细胞壁与亲本壁之间的三角形空间或细胞包壁之间的中央空间，亲本壁的剥落和突出以及细胞的帽状和H状碎片墙。在这两个属中，每个细胞都有其单独的细胞壁，并且它还具有共同的亲本壁或其残余物的一部分。因此，Interfilum 和 Klebsormidium 的营养细胞可能通过相同类型的细胞分裂（类孢子）进行分裂。代表两个属不同物种的各种菌株的特征在于细胞壁超微结构的差异，特别是子细胞周围亲本壁的保存、破裂或糊化水平。不同谱系代表的不同形态是由细胞分离和脱离过程中亲本壁的特征造成的。三个平面中的细胞分裂（在 Interfilum 中很常见，在 Klebsormidium 中很少发生）发生在球形或短圆柱形细胞中，叶绿体垂直或倾斜于细丝（二元）轴。形态差异主要是细胞分裂和脱离后亲本壁命运不同的结果。两个属内不同形态的发展主要取决于细胞的形状、细胞壁的质地、细胞之间的机械相互作用和环境条件的影响等特征。